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