import sys
input = sys.stdin.readline

def main():
    N = int(input())
    M1 = int(input())
    A = list(map(int, input().split()))
    M2 = int(input())
    B = list(map(int, input().split()))
    
    At = [0] * (M1 + 1)
    for i in range(M1):
        At[i+1] = At[i] + A[i]
        
    Bt = [N] * (M2 + 1)
    for i in range(M2):
        Bt[i+1] = Bt[i] - B[i]
    
    count = 0
    
    for i in range(N+1):
        if (i not in At) and (i not in Bt):
            count += 1

    print(count)

if __name__ == '__main__':
    main()