POJ-1006-Biorhythms

#include <stdio.h>

#define MOD 21252

int biorhythms(int, int, int, int);

int main() {
int p, e, i, d, j = 1;
while (1) {
scanf("%d%d%d%d", &p, &e, &i, &d);
if (p == -1 && e == -1 && i == -1 && d == -1) {
break;
}
printf("Case %d: the next triple peak occurs in %d days.\n", j++, biorhythms(p, e, i, d));
}
return 0;
}

int biorhythms(int p, int e, int i, int d) {
int bior;

// 47MS
bior = (28 * 33 * 6 * p + 23 * 33 * 19 * e + 23 * 28 * 2 * i) % MOD;
// 16MS
//bior = (5544 * p + 14421 * e + 1288 * i) % MOD;

if (bior <= d) {
bior = MOD + bior - d;
}
else {
bior -= d;
}
return bior;
}