diff --git a/第一讲 变量、输入输出、表达式与顺序语句/654.cpp b/第一讲 变量、输入输出、表达式与顺序语句/654.cpp
new file mode 100644
index 0000000..99b4ba2
--- /dev/null
+++ b/第一讲 变量、输入输出、表达式与顺序语句/654.cpp	
@@ -0,0 +1,14 @@
+#include <cstdio>
+
+int main()
+{
+    int N;
+    int h, m, s;
+    scanf("%d", &N);
+    h = N / (60 * 60);
+    m = N % (60 * 60) / 60;
+    // s = N - h * (60 * 60) - m * 60;
+    s = N % 60;
+    printf("%d:%d:%d", h, m, s);
+    return 0;
+}