> #include<stdio.h>
> main(){
> int num[4],i,j=1;
> long m;
> while(1)
> {
> 
>    for(i=0;i<4;i++)
>    scanf("%d ",&num[i]);
>    if((num[0]==-1)&&(num[1]==-1)&&(num[2]==-1)&&(num[3]==-1))
> break;
> 	for(m=1;;m++)
> 		if(((m-num[0])%23==0)&&((m-num[1])%28==0)&&((m-num[2])%33==0))
> 		{	if(m-num[3]==0)
> 			printf("Case %d: the next triple peak occurs in 21512 days.\n",j);
> 			else
> 
> 			printf("Case %d: the next triple peak occurs in %ld days.\n",j,m-num[3]);
> 		break;
> 		} 
> j++;
> }
> }