def pyramid(Nw, W, Nb, B):
    pyli = []
    W = list(set(W))
    B = list(set(B))
    W_max = max(W)
    B_max = max(B)
    if (W_max < B_max) or ((W_max == B_max) and (len(W) > len(B))):
        W_max, B_max = B_max, W_max
        W, B = B, W
    pyli.append(W_max)
    W.pop(W.index(W_max))
    for i in range(10):
        if len(B) == 0:
            break
        for j in range(len(B)):
            B_max = max(B)
            if B_max < pyli[-1]:
                pyli.append(B_max)
                B.pop(B.index(B_max))
                break
            else:
                B.pop(B.index(B_max))
        else:
            break
        if len(W) == 0:
            break
        for k in range(len(W)):
            W_max = max(W)
            if W_max < pyli[-1]:
                pyli.append(W_max)
                W.pop(W.index(W_max))
                break
            else:
                W.pop(W.index(W_max))
        else:
            break
    ans = len(pyli)
    return ans

def main():
    Nw = int(input())
    W = list(map(int, input().split()))
    Nb = int(input())
    B = list(map(int, input().split()))
    print(pyramid(Nw, W, Nb, B))

if __name__ == '__main__':
    main()