CP003000.苹果和虫子

#include<iostream>
using namespace std;
int main() {
	int n,x,y,ans=0;
	cin >> n >> x >> y;
	if(y%x!=0) {
		ans=n-(y/x+1);
	} else {
		ans=n-y/x;
	}
	if(ans>0) {
		cout << ans;
	} else {
		cout << 0;
	}
	return 0;
}