diff --git a/baekjoon/2557/solutionundefined b/baekjoon/2557/solutionundefined
new file mode 100644
index 0000000..0378fa4
--- /dev/null
+++ b/baekjoon/2557/solutionundefined
@@ -0,0 +1,8 @@
+// [문제 링크]: https://www.acmicpc.net/problem/2557
+
+#include <stdio.h>
+int main()
+{
+    printf("Hello World!");
+}
+​
\ No newline at end of file