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