from collections import Counter
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)

countA = Counter(sumA)
countB = Counter(sumB)

ans = 0
for key in countA :
    target = T - key
    ans += countA[key]*countB[target]

print(ans)