#include <bits/stdc++.h>

using namespace std;

int main() {
  vector<int> vec(3);

  for (int i = 0; i < 3; ++i) {
    cin >> vec.at(i);
  }

  sort(vec.begin(), vec.end());

  if (vec.at(0) - vec.at(1) == vec.at(1) - vec.at(2)) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}
#include "bits/stdc++.h"
using namespace std;
// Hi 
const double eps = 0.0000001;
int main(){
    ios::sync_with_stdio(0);cin.tie(0);
    long double r,x,y;
    cin>>r>>x>>y;
    long double d = sqrt(x*x+y*y);
    if(fabs(d-r) < eps){
        cout<< 1 << '\n';
    }else if(d <= r+r){
        cout << 2 << '\n';
    }else{
        cout << ceil(d/r) << '\n';
    }
    return 0;
}