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