#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)) {
    if (y == n / 2 || y == (n / 2 + 1)) {
      cout << "NO";
      return 0;
    }
  }
  cout << "YES";
  return 0;
}
