#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#include <bits/stdc++.h>

#define var auto
using namespace std;
using ll = long long;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int h, w;
    cin >> h >> w;
    string map;
    for (size_t i = 0; i < h; i++) {
        string tmp;
        cin >> tmp;
        map += tmp;
    }

    vector<int> dists(h * w);

    for (int i = 0; i < h; i++)
        for (int j = 0; j < w; j++)
        {
            var id = i * w + j; dists[id] = i + j;
        }

    vector<vector<int>> graph(h * w, vector<int>());
    for (int i = 0; i < h - 1; i++)
        for (int j = 0; j < w; j++)
        {
            var id = i * w + j; graph[id].push_back(id + w); graph[id + w].push_back(id);
        }
    for (int i = 0; i < h; i++)
        for (int j = 0; j < w - 1; j++)
        {
            var id = i * w + j; graph[id].push_back(id + 1); graph[id + 1].push_back(id);
        }

    vector<int> shortest(graph.size(), 1L << 60);
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pqueue{};
    pqueue.push(make_pair(0, 0));
    while (!pqueue.empty())
    {
        var item = pqueue.top();
        pqueue.pop();
        if (shortest[item.second] != 1L << 60) continue;
        shortest[item.second] = item.first;
        for(var&& elem : graph[item.second])
        {
            if (shortest[elem] != 1L << 60) continue;
            pqueue.push(make_pair(item.first + 1 + (map[elem] == 'k' ? dists[elem] : 0), elem));
        }
    }
    cout << shortest[h * w - 1] << endl;
    return 0;
}