def twoArrays(k, A, B):
    s_A = sorted(A)
    r_B = sorted(B, reverse=True)
    for i in range(len(s_A)):  # since len(s_A) = len(A) = len(B)
        if s_A[i] + r_B[i] < k:
            return "NO"
    return "YES"