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