b = int(input())
black = sorted([ int(v) for v in input().split() ])
w = int(input())
white = sorted([ int(v) for v in input().split() ])



base = 0
turn = 0

def making(inlist1,inlist2):
    base = 0
    turn = 0

    for i in range(10):
        work = 0
        for j in inlist1:
        
            if j > base:
                base = j
                turn += 1
                work = 1
                break
        if work == 0:
            break

        
        work = 0
        for j in inlist2:
            if j > base:
                base = j
                turn += 1
                work = 1
                break
        if work == 0:
            break
   
    return turn
    
print(max(making(black,white),making(white,black)))