diff --git a/chaeryeon823/BOJ_11399.js b/chaeryeon823/BOJ_11399.js
new file mode 100644
index 0000000..7edb444
--- /dev/null
+++ b/chaeryeon823/BOJ_11399.js
@@ -0,0 +1,35 @@
+// ATM
+// 정렬
+// S4
+
+const readline = require("readline");
+
+const rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout,
+});
+
+let inputCount = 0;
+let n;
+let arr;
+
+rl.on("line", (line) => {
+  if (inputCount === 0) {
+    n = parseInt(line);
+    inputCount++;
+  } else {
+    arr = line.split(" ").map(Number);
+    arr.sort((a, b) => a - b);
+
+    let result = 0;
+    let j = 0;
+
+    for (let i = n; i > 0; i--) {
+      result += arr[j] * i;
+      j++;
+    }
+
+    console.log(result);
+    rl.close();
+  }
+});