diff --git "a/week1/1. \355\225\230\354\203\244\353\223\234 \354\210\230/Solution.java" "b/week1/1. \355\225\230\354\203\244\353\223\234 \354\210\230/Solution.java"
index 0411734..d618db0 100644
--- "a/week1/1. \355\225\230\354\203\244\353\223\234 \354\210\230/Solution.java"	
+++ "b/week1/1. \355\225\230\354\203\244\353\223\234 \354\210\230/Solution.java"	
@@ -5,9 +5,22 @@
 class Solution {
 
     public boolean solution(int x) {
-        return false;
+
+        int sum = sumOfDigit(x);
+
+        return x % sum == 0;
     }
 
-}
+    private int sumOfDigit(int x) {
+
+        int sum = 0;
+
+        while (x > 0) {
+            sum += x % 10;
+            x /= 10;
+        }
+
+        return sum;
+    }
 
-    
\ No newline at end of file
+}
\ No newline at end of file