#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  if (x >= n / 2 && x <= n / 2 + 1 && y >= n / 2 && y <= n / 2 + 1)
    cout << "NO";
  else
    cout << "YES";
  cout << endl;
  return 0;
}
