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