Joro the naughty - C#

using System;
using System.Collections.Generic;



class Program
{
    static void Main(string[] args)
    {
        string buffer = Console.ReadLine();
        string[] container = buffer.Split(' ');
        int n = int.Parse(container[0]);
        int m = int.Parse(container[1]);
        int jumps = int.Parse(container[2]);

        buffer = Console.ReadLine();
        container = buffer.Split(' ');

        int start_row = int.Parse(container[0]);
        int start_col = int.Parse(container[1]);

        //create the matrix
        int[,] matrix = new int[n, m];
        int counter = 1;
        List<int> numbersJumpedOn = new List<int>();

        for (int i = 0; i < n; i++)
        {
            for (int j = 0; j < m; j++)
            {
                matrix[i, j] = counter++;
            }
        }

        //adding starting position to the arraylIst
        numbersJumpedOn.Add(matrix[start_row, start_col]);

        List<string> allJumps = new List<string>();

        for (int i = 0; i < jumps; i++)
        {
            allJumps.Add(Console.ReadLine());
        }
        int k = 0;
        while(true)
        {
            if (k > jumps-1)
            {
                k = 0;
            }
            container = allJumps[k].Split(' ');
            k++;

            int nextJum_row = int.Parse(container[0]);
            int nextJum_col = int.Parse(container[1]);

            start_row += nextJum_row;
            start_col += nextJum_col;

            if (start_row < 0 || start_col < 0 || start_row > n-1 || start_col > m-1)
            {
                Console.WriteLine("escaped {0}", Sum(numbersJumpedOn));
                break;
            }
            if (numbersJumpedOn.IndexOf(matrix[start_row, start_col]) == -1)
            {
                numbersJumpedOn.Add(matrix[start_row, start_col]);
            }
            else
            {
                Console.WriteLine("caught {0}", numbersJumpedOn.Count-1);
                break;
            }
        }
    }

    public static int Sum(List<int> baba)
    {
        int sum = 0;
        foreach (var item in baba)
        {
            sum += item;
        }
        return sum;
    }
}