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