using System;
using System.Text;
using System.Linq;

namespace ConsoleApp11
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());

            int[] T = new int[N];
            string[] S = new string[N];

            int count1 = 0;
            int count2 = 0;

            for(int i = 0; i < N; i++)
            {
                var input = Console.ReadLine().Trim().Split(' ');

                T[i] = int.Parse(input[0]);
                S[i] = input[1];
            }

            for(int i = 0; i < N; i++)
            {
                int x = (T[i] * 12) / 1000;

                for(int j = 0; j < x; j++)
                {
                    count1++;
                }

                count2 += S[i].Length - x;
            }
        }        
    }
}