#include <bits/stdc++.h>
int main() {
  int a, b, c;
  scanf("%d%d%d", &a, &b, &c);
  a = a / 2;
  if (b >= a && b <= a + 1 && c >= a && c <= a + 1) {
    printf("NO");
    return 0;
  }
  printf("YES");
  return 0;
}
