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