#include<iostream>
using namespace std;
int main(){
    int n,x,y,num;
    cin>>n>>x>>y;
    if(y%x==0)num=y/x>=n?0:n-y/x;
    else num=y/x>=n-1?0:n-1-y/x;
    cout<<num<<endl;
    return 0;
}