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