> #include <stdio.h>
> int main()
> {
>     int p,e,i,d,m,j;
>     scanf("%d%d%d%d",&p,&e,&i,&d);
>     m=0;
>     while(p>=0&&e>=0&&i>=0&&d>=0)
>     {
>       for(j=0;p<=21252;j++)
>       {
>         p=p+23;
>         if((p-e)%28==0&&(p-i)%33==0)
>             break;
>       }
>       m++;
>     printf("Case %d: the next triple peak occurs in %d days.\n",m,p-d);
>     scanf("%d%d%d%d",&p,&e,&i,&d);
>     }
>     return 0;
> }