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