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