#include <iostream.h>

int p, e, i, d;
int s;

void main(){
	while(1){
		s++;
		cin >> p >> e >> i >> d;
		if( p == -1 )
			break;
		int k;
		for( k = p; ; k += 23 ){
			if( k - e > 0 && ( k - e ) % 28 == 0 )
				break;
		}
		
		int j;
		for( j = k; ; j += 23 * 28 ){
			if( j - k > 0 && ( j - i ) % 33 == 0 )
				break;
		}
		cout << "Case "<<s<<": the next triple peak occurs in "<<j-d<<" days." << endl;

	}
}