class Proc {
    let blackBlock:[Int]
    let whiteBlock:[Int]
    init() {
        _ = readLine()!
        self.whiteBlock = readLine()!.split(separator: " ").map{ Int($0)!}.sorted()
        _ = readLine()!
        self.blackBlock = readLine()!.split(separator: " ").map{ Int($0)! }.sorted()
    }
    public func doProc() {
        var ans = GetAns(idx: blackBlock.count - 1, isBlack: true)
        ans = max(ans, GetAns(idx: whiteBlock.count-1, isBlack: false))
        print(ans)
    }

    private func GetAns(idx:Int, isBlack:Bool) -> Int {
        let currentLen = isBlack ? self.blackBlock[idx] : self.whiteBlock[idx]

        var next = -1

        if isBlack {
            for i in 0..<whiteBlock.count {
                if whiteBlock[i] > currentLen {
                    break
                }
                next = i
            }
        } else {
            for i in 0..<blackBlock.count {
                if blackBlock[i] > currentLen {
                    break
                }
                next = i
            }
        }

        if next < 0 {
            return 1
        }
        let ans = GetAns(idx: next, isBlack: !isBlack) + 1
        return ans
    }
}

Proc().doProc()