#include<iostream>
#include<algorithm>
#include<bits/stdc++.h>
#include<cstdlib>
#include<cstdio>
#include<cstring>
#include<cmath>
using namespace std;
double x,n,m;
int ans; 
int main()
{
 cin>>n>>x>>m;
    if(x==0||x<0)
    {
    	cout<<0;
	}
	if(x!=0)
	{
	ans=(int)n-(int)m/(int)x;
    cout<<ans<<endl;
}
    return 0;
}```