> 
> #include<iostream>
> using namespace std;
> int main(int argc, char* argv[])
> {
> 	int p,e,i,d,m=1;
> 	cin>>p>>e>>i>>d;
> 	while(p!=-1&&e!=-1&&i!=-1&&d!=-1)
> 	{
> 		for(int j=1; ;j++)
> 		{
> 			if((23*j+p-e)%28==0&&(23*j+p-i)%33==0)
> 			{
> 				cout<<"case "<<m++<<": the next triple peak occurs in "<<(23*j+p-d)<<" days."<<endl;
> 				break;
> 			}
> 		}
> 		cin>>p>>e>>i>>d;
> 	}
> 	
> 	return 0;
> }