#include <bits/stdc++.h>
using namespace std;
const int INF = 0x3f3f3f3f;
const int MX = 100000 + 10;
int main() {
  int n;
  int sx, sy;
  scanf("%d", &n);
  scanf("%d%d", &sx, &sy);
  int m = n / 2;
  if (sx <= m + 1 && sx >= m && sy <= m + 1 && sy >= m)
    printf("NO\n");
  else
    printf("YES\n");
  return 0;
}
