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