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