soal2

import java.util.Arrays;
import java.util.Scanner;

public class training2 {
    static Scanner scan = new Scanner(System.in);
    static int jumlahDiservis = scan.nextInt();
    static int i = 0;
    static int j = 0;
    public static void main(String[] args) {
        int[] harga = new int[jumlahDiservis];
        String[] status = new String[jumlahDiservis];
        for (int a = 0; a<jumlahDiservis; a++){
            harga[a] = scan.nextInt();
            status[a] = scan.nextLine();
        }
        int jmlPerHari = scan.nextInt();
        System.out.println(getMaxRevenue(harga,status,jmlPerHari));
    }

    static int getMaxRevenue(int[] cost, String[] detail, int maxLaptop){
        int[] tampungHarga = new int[cost.length];
        while (i < cost.length){
            //untuk hari
            int angka = 0;
            while (j < cost.length) {
                tampungHarga[i] += cost[j];
                if (detail[j].equals(" original"))
                    angka++;

                if (angka == maxLaptop) {
                    j += 1; break;
                }

                if (j == cost.length - 1)
                    tampungHarga[i] = 0;
                j++;
            }
            i++;
        }
        Arrays.sort(tampungHarga);
        return tampungHarga[tampungHarga.length-1];
    }
}