특산물 교환

 

 

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <iomanip>

using namespace std;

int main() {
	int n,m;
	int answer= 0;
	
	cin >> n >> m;
	
	n = n-m;
	
	answer += n/500;
	n %= 500;
	
	answer += n/100;
	n %= 100;
	
	answer += n/50;
	n %= 50;
	
	answer += n/10;
	n %= 10;
	
	cout << answer;
	
    return 0;
}