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