diff --git a/QUSTOJ/1731.c b/QUSTOJ/1731.c
new file mode 100644
index 0000000..984e00d
--- /dev/null
+++ b/QUSTOJ/1731.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+int main()
+{
+    printf("3121\n");
+    return 0;
+}