北大ACM（1006Biorhythms）代码

/*
	Memory 87K Time 0MS
*/
#include <stdio.h>

int main()
{
	int p, e, i, d;
	int t;
	int c = 0;
	int peakOfCycle;
	while (1)
	{
		scanf_s("%d %d %d %d", &p, &e, &i, &d);
		if (p == -1)
			break;
		t = 0;
		p %= 23; e %= 28; i %= 33;
		while (1)
		{
			peakOfCycle = p + t++ * 23;
			if (peakOfCycle <= d) continue;
			if ((peakOfCycle - e) % 28 == 0 && (peakOfCycle - i) % 33 == 0)
			{
				printf_s("Case %d: the next triple peak occurs in %d days.\n", ++c, peakOfCycle - d);
				break;
			}
		}

	}

	return 0;
}