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