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