#include <bits/stdc++.h>
using namespace std;
const int N = 102;
bool Map[N][N];
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  int p = n / 2;
  int x1 = p, y1 = p;
  int x2 = p, y2 = p + 1;
  int x3 = p + 1, y3 = p;
  int x4 = p + 1, y4 = p + 1;
  if (x == x1 && y == y1) {
    cout << "NO" << endl;
  } else if (x == x2 && y == y2) {
    cout << "NO" << endl;
  } else if (x == x3 && y == y3) {
    cout << "NO" << endl;
  } else if (x == x4 && y == y4) {
    cout << "NO" << endl;
  } else {
    cout << "YES" << endl;
  }
  return 0;
}
