#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c;
  scanf("%d%d%d", &a, &b, &c);
  a = a / 2;
  if ((a == b || a + 1 == b) && (a == c || a + 1 == c)) {
    printf("NO\n");
  } else {
    printf("YES\n");
  }
}
