> #include<stdio.h>
> int main()
> {
>     int p,e,i,d;
>     int x,k;
>     while(~scanf("%d%d%d%d",&p,&e,&i,&d))
>     {
>         if(p==-1&&e==-1&&i==-1&&d==-1)
>             break;
>         x=d;
>         k=1;
>         while(x<=d+21252)
>         {
>             if((x-p)%23==0&&(x-e)%28==0&&(x-i)%33==0)
>                 break;
>             x++;
>             k++;
>         }
>         if(x==d)
>             printf("Case %d: the next triple peak occurs in 21252 days.\n",k);
>         else
>             printf("Case %d: the next triple peak occurs in %d days.\n",k,x-d);
> 
>     }
>     return 0;
> }