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