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