#include <stdio.h> int main() { long long t; scanf("%lld", &t); // 计算最后一次响铃的总秒数 long long last_ring = (t / 1800) * 1800; // 转换为小时、分钟和秒 long long hours = last_ring / 3600; long long minutes = (last_ring % 3600) / 60; long long seconds = last_ring % 60; printf("%lld %lld %lld\n", hours, minutes, seconds); return 0; }