fruits juice

import java.util.*;
import java.io.*;
import java.math.*;


class Solution {
static class Fruit
{
    String name;
    int need;
    public Fruit(String name, int need)
    {
        this.name = name;
        this.need = need;
    }
    public String toString()
    {
        return String.format("nom :  %s%n need : %s%n", name,need);
    }
}

    public static void main(String args[])
    {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
        if (in.hasNextLine())
        {
            in.nextLine();
        }
        Fruit fruits[] = new Fruit[N];
        for (int i = 0; i < N; i++)
        {
            String s = in.nextLine();

            fruits[i] = new Fruit(s.split(" ")[0], Integer.parseInt(s.split(" ")[1]));
        }
        String LINE = in.nextLine();
        int sum = 0;
        for(int i=0; i < fruits.length; i++)
        {
            int nombre = countXInString(LINE, fruits[i].name);
            sum = sum + nombre/fruits[i].need;
        }

        System.out.println(sum);
    }
    public static int countXInString(String s, String x)
    {
        int res = 0;
        for(int i = 0; i < s.length(); i++)
        {
            if(s.charAt(i) == x.charAt(0))
                res++;
        }
        return res;
    }

}