#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("YES");
    return 0;
  }
  printf("NO");
  return 0;
}
