> /* C++ */
> 
> #include<iostream>
> 
> using namespace std ;
> 
> int triple_peak( int, int, int, int ) ; 
> 
> int main()
> {
>    int counter = 1 ;
> 
>    int p = 0, e = 0, i = 0, d = 0 ;
> 
>    while( cin >> p >> e >> i >> d )
>    {
>       if( p == -1 && e == -1 && i == -1 && d == -1 )
> 		  break ;
> 	  cout << "Case " << counter++ 
> 	       << ": the next triple peak occurs in "
> 	       <<  triple_peak( p % 23, e % 28, i % 33, d ) << " days.\n" ;
>    
>    }
> 
>    return 0 ;
> }
> 
> 
> int triple_peak( int p, int e, int i, int d )
> {
> 	int e_p = ( e - p + 28 ) % 28 ;
> 
> 	int i_p = ( i - p + 33 ) % 33 ;
> 
> 	int e_p_n = 0 ;
> 
> 	int i_p_n = 0 ;
> 
> 	for( int counter = 1 ; counter <= 28 ; counter++ )
> 		if( (23 * counter) % 28 == e_p )
> 			break ;
> 
> 		e_p_n = counter ;
> 
>     for( counter = 1 ; counter <= 33 ; counter++ )
> 		if( (23 * counter) % 33 == i_p )
> 			break ;
> 
> 		i_p_n = counter ;
> 
> 	int i_e = ( i_p_n - e_p_n + 33 ) % 33 ;
> 
> 	for( counter = 1 ; counter <= 33 ; counter++ )
> 		if( (28 * counter) % 33 == i_e )
> 			break ;  
> 	
> 	return  23 * ( 28 * counter + e_p_n ) + p - d ;
> }