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