import sys
input = sys.stdin.readline

T = int(input())
n, A = int(input()), list(map(int, input().split()))
m, B = int(input()), list(map(int, input().split()))

sumA = []
for i in range(n) :
    currentSum = 0
    for a in A[i:] :
        currentSum += a
        sumA.append(currentSum)

sumB = []
for i in range(m) :
    currentSum = 0
    for b in B[i:] :
        currentSum += b
        sumB.append(currentSum)

sumA.sort()
sumB.sort()

L, R = 0, len(sumB) - 1
ans = 0

while L < len(sumA) and R >= 0 :
    a, b = sumA[L], sumB[R]
    
    if a + b == T:
        na = 0
        while L < len(sumA) and a == sumA[L] :
            L += 1
            na += 1
        
        nb = 0
        while R >= 0 and b == sumB[R] :
            R -= 1
            nb += 1
        
        ans += na*nb
    
    else :
        if a + b > T :
            R -= 1
        else :
            L += 1

print(ans)