枚举

//poj1006#include 
      
       using namespace std;int        a, b, c, d, t, dd;void work(){    a %= 23;    b %= 28;    c %= 33;    dd = d;    while (1)    {        d++;        if (d % 23 == a && d % 28 == b && d % 33 == c)        {            printf("Case %d: the next triple peak occurs in %d days.\n", t, d - dd);            return;        }    }}int main(){    //freopen("t.txt", "r", stdin);    t = 0;    while (cin >> a >> b >> c >> d)    {        t++;        if (a == -1 && b == -1 && c == -1 && d == -1)            break;        work();    }    return 0;}