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