diff --git a/src/addition.c b/src/addition.c
index 0298801..ca1d9ed 100644
--- a/src/addition.c
+++ b/src/addition.c
@@ -24,6 +24,10 @@ unsigned int addition(num number1, num number2) {
     return result;
 }
 
+unsigned int s(unsigned int a) {
+    return a >> 31;
+}
+
 float addition_float(float a, float b) {
     return 0.0;
 }
\ No newline at end of file
diff --git a/src/addition.h b/src/addition.h
index 0898765..80ede14 100644
--- a/src/addition.h
+++ b/src/addition.h
@@ -7,6 +7,8 @@ void full_adder (num* sum, num* nextcarry, num number1, num number2, num carry);
 
 unsigned int addition(num a, num b);
 
+unsigned int s(unsigned int a);
+
 float addition_float(float a, float b);
 
 #endif // ADDITION_H