> #include <stdio.h>
> 
> int main(){
>     int p,i,e,d,x,j = 1;
>     while(scanf("%d %d %d %d",&p,&i,&e,&d) && p!=-1){
>         x = (p * 5544 + i * 14421 + e * 1288 + 21252 - d) % 21252;
>         printf("Case %d: the next triple peak occurs in %d days.\n",j++,x?x:21252);
>     }   
>     return 0;
> }