求助

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,x,y;
	cin>>n>>x>>y;
	if(x==0){
		cout<<0<<endl;
		return 0;
	}
	int m=y/x;
	if(x%y!=0) m++;
	if(n-m<0) cout<<0<<endl;
	else cout<<n-m<<endl;
	return 0;
}