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