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