#include <bits/stdc++.h>
using namespace std;
double const pi = 3.1415926536;
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  if (x == n / 2 && y == n / 2) {
    cout << "NO";
    return (0);
    ;
  }
  if (x == n / 2 + 1 && y == n / 2 + 1) {
    cout << "NO";
    return (0);
    ;
  }
  if (x == n / 2 + 1 && y == n / 2) {
    cout << "NO";
    return (0);
    ;
  }
  if (x == n / 2 && y == n / 2 + 1) {
    cout << "NO";
    return (0);
    ;
  }
  cout << "YES";
}
