#include <bits/stdc++.h>
using namespace std;
int n2, x, y;
int main() {
  cin >> n2 >> x >> y;
  int n = n2 / 2;
  if (x >= n && x <= n + 1 && y >= n && y <= n + 1)
    cout << "NO";
  else
    cout << "YES";
  return 0;
}
