求不要举报

#include<bits/stdc++.h>
using namespace std;
int main()
{
	long long int n,a,b;
	double c;
	cin>>n>>a>>b;
	c=b*1.0/a;
	c=ceil(c);
	if(n-c<=0)
	cout<<0;
	else
	cout<<n-c;
	return 0;
}