#include<bits/stdc++.h>
using namespace std;

int main() {
    int m,t,s;
    cin>>m>>t>>s;
    int ans;
    if(t==0) cout<<0;
    else if(s%t==0) cout<<m-s/t;
    else if(s%t!=0) cout<<m-s/t-1;
    return 0;
}

为神魔？？？