#include<iostream>

using namespace std;

int main()
{
	int N, M, P, C;
	cin >> N >> M >> P >> C;

	while( N + M + P + C != 0 )
	{
		if( P > M ) //The fake money given to the boss is lager. 
			cout << C + N << endl;
		else // or, subtract the money the customer gived to.
			cout << N + P - M << endl;
		cin >> N >> M >> P >> C;
	}
	
	return 0;
}

• Re:错哪里错哪里错哪里？？？！！！ (428) mervyn_diane 2011-01-04 00:44:29