while(p!=-1 && e!=-1 && i!=-1 && d!=-1)
    {
        p0=p%23;
        e0=e%28;
        i0=i%33;
        count++;
        for(day=d+1;(day-p0)%23!=0 || (day-e0)%28!=0 || (day-i0)%33!=0;day++);
        printf("Case %d: the next triple peak occurs in %d days.\n", count, day-d);
    }

过了，还370MS，数据太弱了～