> #include<iostream.h>
> #include<math.h>
> void main()
> {
> 	
> 	int p,e,i,d,t=0,u=0;
> 	while(1){
> 		u++;
> 		cin>>p>>e>>i>>d;
> 		if(p==-1 && e==-1 && i==-1 && d==-1) break;
> 		for(t=d+1;;t++){
> 			if((t-p)%23==0 && (t-e)%28==0 && (t-i)%33==0){
> 					cout<<"Case "<<u
> 					<<": the next triple peak occurs in "
> 					<<t-d<<" days."<<endl;
> 					break;
> 				}
> 		}
> 		
> 	}
> }