// 找出通過車輛最多的顏色
    func HW2023030() {
        // 測試用例
//        let inputStr = "0 1 2 1", k = 3
//        let inputStr = "0 1 2 1", k = 2
        // 開始代碼
        let inputStr = String(readLine()!)
        let k = Int(readLine()!)!
        let str = inputStr.replacingOccurrences(of: " ", with: "")
        let inputArr = inputStr.components(separatedBy: " ").map { Int($0) ?? 0}
        let len = inputArr.count - k + 1
        var res = 0
        for i in 0..<len {
            let temp = String(str.dropFirst(i).prefix(k))
            var resArr: [Int] = [0,0,0]
            for j in temp {
                if j == "0" {
                    resArr[0] += 1
                }else if j == "1" {
                    resArr[1] += 1
                }else if j == "2" {
                    resArr[2] += 1
                }
            }
            res = max(res, resArr.max()!)
        }
        print(res)
    }