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