#include<iostream>
using namespace std;

void main()
{
	int p,e,i,d,nd,x;
	int t=0;
	while(++t){
	cin>>p>>e>>i>>d;
	if(p==-1&&e==-1&&i==-1&&d==-1)
		return;
	if(p==e&&e==i)
		x=21252-(d-p);
	else{
		for(x=p;;x+=23)
			if((x-e)%28==0&&(x-i)%33==0)
				break;
		x=x-d;
	}
	cout<<"Case "<<t<<": the next triple peak occurs in "<<x<<" days."<<endl;
	}
}