diff --git a/src/main/java/Input.java b/src/main/java/Input.java
index d9b2534..b047c82 100644
--- a/src/main/java/Input.java
+++ b/src/main/java/Input.java
@@ -1,5 +1,6 @@
 class Example1 {
     int i;
+    int a = 12345;
     Example e;
     int m(int n){
         int x;
diff --git a/src/main/java/TypeCheck/TypeCheckHelper.java b/src/main/java/TypeCheck/TypeCheckHelper.java
index 6e7542a..173a21e 100644
--- a/src/main/java/TypeCheck/TypeCheckHelper.java
+++ b/src/main/java/TypeCheck/TypeCheckHelper.java
@@ -4,7 +4,7 @@ import java.util.List;
 import java.util.Objects;
 
 public class TypeCheckHelper {
-    public String upperBound(String type1, String type2) throws TypeCheckException{
+    public static String upperBound(String type1, String type2) throws TypeCheckException{
         boolean type1Primitiv = Objects.equals(type1, "boolean") || Objects.equals(type1, "int") || Objects.equals(type1, "char");
         boolean type2Primitiv = Objects.equals(type2, "boolean") || Objects.equals(type2, "int") || Objects.equals(type2, "char");
 
diff --git a/src/main/java/abstractSyntaxTree/Expression/BinaryExpression.java b/src/main/java/abstractSyntaxTree/Expression/BinaryExpression.java
index 4cec259..ba0041d 100644
--- a/src/main/java/abstractSyntaxTree/Expression/BinaryExpression.java
+++ b/src/main/java/abstractSyntaxTree/Expression/BinaryExpression.java
@@ -26,7 +26,6 @@ public class BinaryExpression extends AbstractType implements IExpression{
 
     @Override
     public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
-        TypeCheckHelper helper = new TypeCheckHelper();
         TypeCheckResult result = new TypeCheckResult();
 
         TypeCheckResult leftType = left.typeCheck(methodContext, typeContext, localVars);
@@ -36,7 +35,7 @@ public class BinaryExpression extends AbstractType implements IExpression{
 
             case "&&":
             case "||" :{
-                if (Objects.equals(helper.upperBound(leftType.type, rightType.type), "bool")){
+                if (Objects.equals(TypeCheckHelper.upperBound(leftType.type, rightType.type), "bool")){
                     result.type = "bool";
                 }
                 break;
@@ -47,14 +46,14 @@ public class BinaryExpression extends AbstractType implements IExpression{
             case "<=":
             case ">=":
             case "!=":
-                result.type = helper.upperBound(leftType.type, rightType.type);
+                result.type = TypeCheckHelper.upperBound(leftType.type, rightType.type);
                 break;
 
             case "-":
             case "+":
             case "*":
             case "/":
-                if (Objects.equals(helper.upperBound(leftType.type, rightType.type), "int")){
+                if (Objects.equals(TypeCheckHelper.upperBound(leftType.type, rightType.type), "int")){
                     result.type = "int";
                 }
                 break;
diff --git a/src/main/java/abstractSyntaxTree/StatementExpression/AssignStatementExpression.java b/src/main/java/abstractSyntaxTree/StatementExpression/AssignStatementExpression.java
index eb31a57..e8975f8 100644
--- a/src/main/java/abstractSyntaxTree/StatementExpression/AssignStatementExpression.java
+++ b/src/main/java/abstractSyntaxTree/StatementExpression/AssignStatementExpression.java
@@ -30,7 +30,6 @@ public class AssignStatementExpression extends AbstractType implements IExpressi
 
     @Override
     public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
-        TypeCheckHelper helper = new TypeCheckHelper();
         TypeCheckResult result = new TypeCheckResult();
 
         TypeCheckResult leftType;
@@ -45,7 +44,7 @@ public class AssignStatementExpression extends AbstractType implements IExpressi
         }
         TypeCheckResult rightType = right.typeCheck(methodContext, typeContext, localVars);
 
-        String upperbound = helper.upperBound(leftType.type, rightType.type);
+        String upperbound = TypeCheckHelper.upperBound(leftType.type, rightType.type);
         if(Objects.equals(leftType.type, "boolean"))
             leftType.type = "bool";
         if (!Objects.equals(upperbound, leftType.type)) {