using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace Alamprogrammid
{
    class Tekstifail
    {
        public static void Main(string[] arg) {
            Console.WriteLine(summa2());
        }

        public static int summa2() { 
            int abi = 0;
            string[] m = File.ReadAllLines("c:\\temp\\hinnad2.txt");
            for(int i=0; i<m.Length; i++)
            {
                while (m[i].Contains("  ")) {
                    m[i] = m[i].Replace("  ", " ");
                }
                string[] m2 = m[i].Split(' ');
                abi += int.Parse(m2[0].Trim()) * int.Parse(m2[1].Trim());
            }
            return abi;
        }

        public static void summa1() {
            int abi = 0;
            string[] m = File.ReadAllLines("c:\\temp\\hinnad1.txt");
            foreach (string rida in m) { 
               int abi2;
               if (int.TryParse(rida, out abi2)) {
                   abi += abi2;
               }
            }
            Console.WriteLine("Summa: "+ abi);
        }
        public static void ruutudeLoomine(){
            StreamWriter faili = new StreamWriter("c:\\temp\\ruudud.txt");
            for (int i = 1; i <= 20; i++) {
                faili.WriteLine("{0,5} {1,5}", i, i*i);
            }
            faili.Close();
        }
    }
}