> #include<stdio.h>
> #define N 7
> int main()
> {
> 	int p,e,i,d,j,t=1;
> 	int k=0;
> 	int a[N];
> 	while(p!=-1&&e!=-1&&i!=-1&&d!=-1)
> 	{
> 	   scanf("%d %d %d %d",&p,&e,&i,&d);  
>        for(j=d;j<=21252;j++)
> 			{
> 		       if((j+d-p)%23==0&&(j+d-e)%28==0&&(j+d-i)%33==0&&j!=0)
> 			   {
> 				  a[t]=j;
> 			      t++;
> 			   }
> 			}
> 	   k++;
> 	}
> 	 for(t=1;t<k;t++)
> 		   printf("case %d:the next triple peak occurs in %d days\n",t,a[t]);
>   return 0;
> }