import functools
import typing


def twoArrays(k: int, A: list[int], B: list[int]) -> typing.Literal["NO", "YES"]:
    A.sort()
    B.sort(reverse=True)
    return "NO" if any(a + b < k for a, b in zip(A, B, strict=True)) else "YES"


def twoArrays(k: int, A: list[int], B: list[int]) -> typing.Literal["NO", "YES"]:
    @functools.lru_cache
    def cached_helper(ab: tuple[int, int]) -> bool:
        return sum(ab) < k

    A.sort()
    B.sort(reverse=True)
    return "NO" if any(map(cached_helper, zip(A, B, strict=True))) else "YES"



# 88
s=sorted;twoArrays=lambda k,A,B:["YES","NO"][any(a+b<k for a,b in zip(s(A),s(B)[::-1]))]