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