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