#include<bits/stdc++.h>

using namespace std;

int main(){
  
    int n,x,y;
  
    cin>>n>>x>>y;
  
        if(y/x>=n){
          
            cout<<"0";
          
            return 0;
          
        }
  
        if(y%x==0){
          
            cout<<n-y/x;
          
        }
          
        else{
          
            cout<<n-(y/x+1);
          
        }
  
return 0;
  
}