> #include<iostream>
> #include<cstdio>
> using namespace std;
> int p,e,i,d,n;
> int main()
> {
>     int j=0;
>     while(scanf("%d%d%d%d",&p,&e,&i,&d)==4&&(p+e+i+d)!=-4)
>     {
>         j++;
>         n=i;
>         while(n<=21252+d)
>         {
>             if(n<=d){
>                 n=n+33;
>                 continue;
>             }
>             else if((n-p)%23==0&&(n-e)%28==0){
>                 break;
>             }
>             else n=n+33;
>         }
>         printf("Case %d: the next triple peak occurs in %d days.\n",j,n-d-21252>0?(n-d)%21252:(n-d));
>     }
>     return 0;
> }