if let T = Int(readLine() ?? ""),
   let n = Int(readLine() ?? ""),
   let inputA = readLine(),
   let A = inputA.split(separator: " ").compactMap({Int($0)}) as? [Int],
   let m = Int(readLine() ?? ""),
   let inputB = readLine(),
   let B = inputB.split(separator: " ").compactMap({Int($0)}) as? [Int],
   A.count == n , B.count == m
{
    var countSumB = [Int: Int]()
    for i in 0..<m {
        var currentSumB = 0
        for j in i..<m {
            currentSumB += B[j]
            countSumB[currentSumB, default: 0] += 1
        }
    }
    
    var ans = 0
    for i in 0..<n {
        var currentSumA = 0
        for j in i..<n {
            currentSumA += A[j]
            
            let target = T - currentSumA
            if let cnt = countSumB[target] {
                ans += cnt
            }
        }
    }
    
    print(ans)
}