#include <bits/stdc++.h>
int main() {
  int ss, x, y, flag = 0, kk, flag2 = 1;
  scanf("%d%d%d", &ss, &x, &y);
  if (x == 1 || x == ss) flag++;
  if (y == 1 || y == ss) flag++;
  if (x >= ss / 2 && x <= ss / 2 + 1 && y >= ss / 2 && y <= ss / 2 + 1)
    flag2 = 0;
  if (flag == 0) kk = 9;
  if (flag == 1) kk = 6;
  if (flag == 2) kk = 4;
  printf("%s\n", (ss * ss >= kk * 2 && flag2) ? "YES" : "NO");
}
