spike c#

using System;
using System.IO;
namespace spike
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            StreamReader inf = new StreamReader ("spike.in");
            StreamWriter ouf = new StreamWriter ("spike.out");
            ///////////////////////////////////////////////
            String[] nmk = inf.ReadLine ().Split (' ');
            int n = Convert.ToInt32(nmk[0]);
            int m = Convert.ToInt32(nmk[1]);
            int k = Convert.ToInt32(nmk[2]);
            ///////////////////////////////////////////////
            int[,] city = new int[n,m];
            bool[,] pegas = new bool[n, m];
            int[,] weight = new int[n,m];

            for(int i = 0;i<n;i++)
                for(int j = 0;j<m;j++)
                    weight[i,j] = 10000000;

            for (int i = 0; i < n; i++) {
                string[] city_str = inf.ReadLine().Split (' ');
                for (int j = 0; j < m; j++)
                    city [i, j] = Convert.ToInt32(city_str [j]);
            }
            for (int i = 0; i < k; i++) {
                string[] pegas_xy = inf.ReadLine().Split (' ');
                pegas [Convert.ToInt32(pegas_xy [0]) - 1, Convert.ToInt32(pegas_xy [1])-1] = true;
            }
            ////////////////////////////////////////////////
            weight[0,0] = 0;
            for (int y = 0; y < n; y++) {
                for (int x = 0; x < m; x++) {
                    if (0 <= x + 1 && x + 1 < m && weight [y, x + 1] > weight [y, x] + city [y, x])
                        weight [y, x + 1] = weight [y, x] + city [y, x];
                    if (0 <= y + 1 && y + 1 < n && weight [y + 1, x] > weight [y, x] + city [y, x])
                        weight [y + 1, x] = weight [y, x] + city [y, x];
                    if (pegas [y, x]) {
                        if (0 <= x + 1 && x + 1 < m && 0 <= y + 2 && y + 2 < n && weight [y + 2, x + 1] > weight [y, x] + city [y, x])
                            weight [y + 2, x + 1] = weight [y, x] + city [y, x];
                        if (0 <= x + 2 && x + 2 < m && 0 <= y + 1 && y + 1 < n && weight [y + 1, x + 2] > weight [y, x] + city [y, x])
                            weight [y + 1, x + 2] = weight [y, x] + city [y, x];
                    }
                }
            }
            ouf.WriteLine(weight[n - 1,m - 1]+city[n - 1,m - 1]);
            ouf.Close ();
            inf.Close();
        }
    }
}