#include <bits/stdc++.h>
using namespace std;
template <typename T>
T POW(T b, T p) {
  T r = 1;
  while (p) {
    if (p & 1) r = (r * b);
    b = (b * b);
    p >>= 1;
  }
  return r;
}
template <typename T>
T BigMod(T b, T p, T m) {
  T r = 1;
  while (p) {
    if (p & 1) r = (r * b) % m;
    b = (b * b) % m;
    p >>= 1;
  }
  return r;
}
int main() {
  int n, x, y;
  while (cin >> n >> x >> y) {
    int keep = n / 2;
    if ((x == keep && y == keep) || (x == keep + 1 && y == keep + 1) ||
        (x == keep + 1 && y == keep) || (x == keep && y == keep + 1)) {
      cout << "NO" << endl;
    } else
      cout << "YES" << endl;
  }
}
