#include <bits/stdc++.h>
using namespace std;
long long n, x, y;
int32_t main() {
  cin >> n >> x >> y;
  long long a = n / 2;
  if ((x >= a and x <= a + 1) and (y >= a and y <= a + 1)) {
    cout << "NO" << endl;
    return 0;
  }
  cout << "YES" << endl;
}
