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