diff --git a/bangdori/Minimum Add to Make Parentheses Valid.js b/bangdori/Minimum Add to Make Parentheses Valid.js
new file mode 100644
index 0000000..dea3f4a
--- /dev/null
+++ b/bangdori/Minimum Add to Make Parentheses Valid.js	
@@ -0,0 +1,25 @@
+/**
+ * @param {string} s
+ * @return {number}
+ */
+var minAddToMakeValid = function (s) {
+  let answer = 0;
+  const stack = [];
+
+  for (let i = 0; i < s.length; i++) {
+    if (s[i] === "(") {
+      stack.push(s[i]);
+      continue;
+    }
+
+    if (stack.length > 0 && stack.at(-1) === "(") {
+      stack.pop();
+      continue;
+    }
+
+    answer += 1;
+  }
+
+  answer += stack.length;
+  return answer;
+};