> #include <iostream>
> using namespace std;
> int p, e, i, d, t, n=0;
> int main()
> {
>     while (cin>>p>>e>>i>>d, p!=-1){
>         for (n++,t=d+1; t<=d+21252; t++)
>             if ((t-p)%23==0 && (t-e)%28==0 && (t-i)%33==0) break;
>         printf("Case %d: the next triple peak occurs in %d days.\n", n, t-d);
>     }
>     return 0;
> }