#include <bits/stdc++.h>
using namespace std;
int main()
{
    int m,t,s;
    cin>>m>>t>>s;
    if(t==0){cout<<0;return 0;}
    if(s%t==0)cout<<max(m-s/t,0);
    else cout<<max(m-s/t-1,0);
    return 0;
}