1006 Biorhythms

#include <stdio.h>

int main() {
    int p, e, i, d;
    int n = 0;

    while (1) {
        scanf("%d %d %d %d", &p, &e, &i, &d);

        if (p==-1 && e==-1 && i==-1 && d==-1) {
            break;
        }

        p %= 23;
        e %= 28;
        i %= 33;

        int j = d + 1;

        for (; j < 21252; j ++) {
            if ((j - p) % 23 == 0) break;
        }

        for (; j < 21252; j += 23) {
            if ((j - e) % 28 == 0) break;
        }

        for (; j < 21252; j += 23*28) {
            if ((j - i) % 33 == 0) break;
        }

        n ++;
        printf("Case %d: the next triple peak occurs in %d days.\n", n, j-d);


    }

    return 0;
}