#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  bool ans = 1;
  int n1 = n / 2;
  if (x >= n1 && x <= n1 + 1 && y >= n1 && y <= n1 + 1) ans = 0;
  if (ans)
    cout << "YES\n";
  else
    cout << "NO\n";
  return 0;
}
