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