diff --git a/jungmyunggi/Minimum Add to Make Parentheses Valid.js b/jungmyunggi/Minimum Add to Make Parentheses Valid.js
new file mode 100644
index 0000000..47765e0
--- /dev/null
+++ b/jungmyunggi/Minimum Add to Make Parentheses Valid.js	
@@ -0,0 +1,22 @@
+/**
+ * @param {string} s
+ * @return {number}
+ */
+
+var minAddToMakeValid = function(s) {
+  let openMark = 0;
+  let closeMark = 0;
+  for(const c of s){
+    if(c === "(") openMark += 1;
+    else if(c === ")"){
+        if(openMark !== 0){
+            openMark -= 1;
+        }
+        else{
+            closeMark +=1;
+        }
+    }
+
+  }  
+  return openMark + closeMark
+};