using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
using System.Runtime.Intrinsics.Arm;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static string[] SList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => ReadLine()).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (h, w) = (c[0], c[1]);
        var map = SList(h);
        var dp = new int[h, w];
        for (var s = 1; s < h + w; ++s)
        {
            for (var i = 0; i < h; ++i)
            {
                var j = s - i;
                if (j < 0) break;
                if (j >= w) continue;
                var min = int.MaxValue;
                if (i > 0) min = Math.Min(min, dp[i - 1, j]);
                if (j > 0) min = Math.Min(min, dp[i, j - 1]);
                ++min;
                if (map[i][j] == 'k') min += i + j;
                dp[i, j] = min;
            }
        }
        WriteLine(dp[h - 1, w - 1]);
    }
}