diff --git a/Chapter 12/Exercise 12.4 b/Chapter 12/Exercise 12.4
new file mode 100644
index 0000000..079b15a
--- /dev/null
+++ b/Chapter 12/Exercise 12.4	
@@ -0,0 +1,13 @@
+let val = 5;
+val += adder();
+val += adder();
+val += adder();
+console.log(val);
+function adder(){
+let counter = val;
+for(let i=0;i<val;i++){
+counter++;
+}
+return counter ;
+}
+