#include <bits/stdc++.h>
const int inf = 1000 * 1000 * 1000;
using namespace std;
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  n /= 2;
  if (x == n && y == n || x == n && y == n + 1 || x == n + 1 && y == n ||
      x == n + 1 && y == n + 1)
    cout << "NO";
  else
    cout << "YES";
  return 0;
}
