using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[,] rawData = { { 1, 3, 9, 2, 7, 8, 9 }, { 120, 70, 76, 190, 300, 50, 40 } };

        var data = new List<Tuple<int, int>>();

​

        for(int i = 0; i < rawData.GetLength(1); i++)

        {

            data.Add(new Tuple<int, int>(rawData[0, i], rawData[1, i]));

        }

​

        var result = data.OrderByDescending(x => x.Item2).First().Item1;

​

        Console.WriteLine(result);

    }

}