#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,X,y;
    cin>>n>>X>>y;
    if(y<=n*X)
    {
        int a=n-(y/X);
        if(y%X==0)
        {
            cout<<a;
        }
        else
        {
            a=a-1;
            cout<<a;
        }
    }
    return 0;
}