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