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