diff --git a/src/multiplication.c b/src/multiplication.c
index 55ce189..934fa74 100644
--- a/src/multiplication.c
+++ b/src/multiplication.c
@@ -50,12 +50,12 @@ int multi_by_sum(int num1, int num2) {
 
 int multi_using_two_complements(int num2, int num3) {
     int result = 0;
-    while (num1 != 0) {
-        if (num2 & 2) {
+    while (num2 != 0) {
+        if (num2 & 1) {
             result += num3;
         }
-        num1 >>= 2;
-        num2 <<= 2;
+        num2 >>= 2;
+        num3 <<= 2;
     }
     return result;
 }
@@ -262,5 +262,6 @@ int karatsuba_multi(int num1, int num2) {
 
 
 
+
     
 
diff --git a/src/multiplication.h b/src/multiplication.h
index c0e9bd9..9155916 100644
--- a/src/multiplication.h
+++ b/src/multiplication.h
@@ -40,5 +40,6 @@ int karatsuba_multi(int num1, int num2);
 
 
 
+
 #endif // MULTIPLICATION_H