diff --git a/lab2/zad3/package.xml b/lab2/zad3/package.xml
new file mode 100644
index 0000000..85095be
--- /dev/null
+++ b/lab2/zad3/package.xml
@@ -0,0 +1,9 @@
+<package>
+    <name>GF</name>
+    <namespace>GF</namespace>
+    <test>
+        <filein>test/Test.st</filein>
+    </test>
+    <filein>src/GF.st</filein>
+    <filein>src/main.st</filein>
+</package>
diff --git a/lab2/zad3/run.st b/lab2/zad3/run.st
new file mode 100644
index 0000000..287e7c6
--- /dev/null
+++ b/lab2/zad3/run.st
@@ -0,0 +1 @@
+PackageLoader fileInPackage: #GF.
diff --git a/lab2/zad3/src/GF.st b/lab2/zad3/src/GF.st
new file mode 100644
index 0000000..ae3b88b
--- /dev/null
+++ b/lab2/zad3/src/GF.st
@@ -0,0 +1,115 @@
+Object subclass: GF [
+    | characteristic value |
+    
+    GF class >> create: newCharacteristic [
+        ^self new initialize: newCharacteristic
+            withValue: 0;
+            yourself
+    ]
+
+    GF class >> create: newCharacteristic withValue: newValue [
+        ^self new initialize: newCharacteristic
+            withValue: newValue;
+            yourself
+    ]
+
+    initialize: newCharacteristic withValue: newValue [
+        characteristic := newCharacteristic.
+        value := newValue.
+    ]
+
+    verifyCharacteristics: rhs [
+        (characteristic ~= rhs characteristic)
+            ifTrue: [Error signal: 'both arguments must have the same characteristic']
+    ]
+
+    + rhs [
+        self verifyCharacteristics: rhs.
+        ^GF create: characteristic
+            withValue: ((value + rhs value) \\ characteristic)
+    ]
+
+    - rhs [
+        self verifyCharacteristics: rhs.
+        "^GF create: characteristic
+            withValue: ((value < (rhs value))
+                        ifTrue: [ ^(characteristic - ((rhs value) - value)) ]
+                        ifFalse: [ ^(value - (rhs value)) ])"
+        (value < (rhs value))
+            ifTrue: [
+                ^GF create: characteristic
+                    withValue: (characteristic - ((rhs value) - value))
+            ]
+            ifFalse: [
+                ^GF create: characteristic
+                    withvalue: (value - (rhs value))
+            ].
+    ]
+
+    * rhs [
+        self verifyCharacteristics: rhs.
+        ^GF create: characteristic
+            withValue: ((value * rhs value) \\ characteristic)
+    ]
+
+    / rhs [
+        | inverse |
+        self verifyCharacteristics: rhs.
+        (rhs value = 0) ifTrue: [ZeroDivide signal: 'division by 0 is illegal'].
+
+        1 to: (characteristic - 1) do: [ :i |
+            (((rhs value * i) \\ characteristic) = 1) ifTrue: [
+                inverse := i.
+            ]
+        ].
+
+        ^GF create: characteristic
+            withValue: ((value * inverse) \\ characteristic)
+    ]
+
+    = rhs [
+        self verifyCharacteristics: rhs.
+        ^value = rhs value
+    ]
+
+    ~= rhs [
+        self verifyCharacteristics: rhs.
+        ^value ~= rhs value
+    ]
+
+    > rhs [
+        self verifyCharacteristics: rhs.
+        ^value > rhs value
+    ]
+
+    < rhs [
+        self verifyCharacteristics: rhs.
+        ^value < rhs value
+    ]
+
+    >= rhs [
+        self verifyCharacteristics: rhs.
+        ^value >= rhs value
+    ]
+
+    <= rhs [
+        self verifyCharacteristics: rhs.
+        ^value <= rhs value
+    ]
+
+    characteristic [
+        ^characteristic
+    ]
+
+    value [
+        ^value
+    ]
+
+    displayOn: stream [
+        'GF<' displayOn: stream.
+        characteristic displayOn: stream.
+        '>(' displayOn: stream.
+        value displayOn: stream.
+        ')' displayOn: stream.
+    ]
+]
diff --git a/lab2/zad3/src/main.st b/lab2/zad3/src/main.st
new file mode 100644
index 0000000..ee234e2
--- /dev/null
+++ b/lab2/zad3/src/main.st
@@ -0,0 +1,32 @@
+FileStream fileIn: 'src/GF.st'.
+
+a := GF create: 1234577 withValue: ((stdin nextLine) asInteger).
+b := GF create: 1234577 withValue: ((stdin nextLine) asInteger).
+
+a displayOn: stdout.
+' + ' displayOn: stdout.
+b displayOn: stdout.
+' = ' displayOn: stdout.
+(a + b) displayOn: stdout.
+'' displayNl.
+
+a displayOn: stdout.
+' - ' displayOn: stdout.
+b displayOn: stdout.
+' = ' displayOn: stdout.
+(a - b) displayOn: stdout.
+'' displayNl.
+
+a displayOn: stdout.
+' * ' displayOn: stdout.
+b displayOn: stdout.
+' = ' displayOn: stdout.
+(a * b) displayOn: stdout.
+'' displayNl.
+
+a displayOn: stdout.
+' / ' displayOn: stdout.
+b displayOn: stdout.
+' = ' displayOn: stdout.
+(a / b) displayOn: stdout.
+'' displayNl.
diff --git a/lab2/zad3/test/Test.st b/lab2/zad3/test/Test.st
new file mode 100644
index 0000000..782462d
--- /dev/null
+++ b/lab2/zad3/test/Test.st
@@ -0,0 +1,50 @@
+FileStream fileIn: 'src/GF.st'.
+
+a := GF create: 5 withValue: 2.
+b := GF create: 5 withValue: 4.
+
+(a + b) = (GF create: 5 withValue: 1)
+    ifFalse: [self error: 'failed on the addition test!'].
+
+(a - b) = (GF create: 5 withValue: 3)
+    ifFalse: [self error: 'failed on the subtraction test!'].
+
+a := GF create: 6 withValue: 2.
+b := GF create: 6 withValue: 4.
+
+(a * b) = (GF create: 6 withValue: 2)
+    ifFalse: [self error: 'failed on the multiplication test!'].
+
+a := GF create: 7 withValue: 2.
+b := GF create: 7 withValue: 4.
+
+(a / b) = (GF create: 7 withValue: 4)
+    ifFalse: [self error: 'failed on the division test!'].
+
+a := GF create: 5 withValue: 2.
+b := GF create: 5 withValue: 0.
+
+exceptionRaised := false.
+
+(a / b) on: ZeroDivide do: [ :sig |
+    exceptionRaised := true.
+    ((sig errorString) = 'division by 0 is illegal')
+        ifFalse: [self error: 'division by 0 error string doesn''t match!'].
+].
+
+exceptionRaised
+    ifFalse: [self error: 'failed on the division by 0 test!'].
+
+a := GF create: 10 withValue: 5.
+b := GF create: 8 withValue: 5.
+
+exceptionRaised := false.
+
+(a + b) on: Error do: [ :sig |
+    exceptionRaised := true.
+    ((sig errorString) = 'both arguments must have the same characteristic')
+        ifFalse: [self error: 'different characteristics error string doesn''t match!'].
+].
+
+exceptionRaised
+    ifFalse: [self error: 'failed on the different characteristics test!'].