#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<queue>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)1e18;
constexpr long long MOD = 1'000'000'007; 

string yn(bool f){return f?"Yes":"No";}
string YN(bool f){return f?"YES":"NO";}

#define f first
#define s second

signed main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	cout<<fixed<<setprecision(10);
	
	int dx[2] = {1,0};
	int dy[2] = {0,1};
	int H, W;
	vector<string> a;
	vector<vector<int>> dis, dis2;
	priority_queue<pair<pair<int,int>,pair<int,int>>, vector<pair<pair<int,int>,pair<int,int>>>, greater<pair<pair<int,int>,pair<int,int>>>> Q;
	
	cin>>H>>W;
	
	a.resize(H);
	dis.resize(H, vector<int>(W, INF));
	dis2.resize(H, vector<int>(W, INF));
	
	for(int i = 0; i < H; i++){
		cin>>a[i];
	}
	
	Q.push({{0,0},{0,0}});
	dis[0][0] = 0;
	dis2[0][0] = 0;
	
	while(!Q.empty()){
		pair<pair<int,int>,pair<int,int>> P = Q.top(); Q.pop();
		int d1 = P.first.first, d2 = P.first.second;
		int y = P.second.first, x = P.second.second;
		
		if(dis[y][x] < d1) continue;
		
		if(y == H-1 && x == W-1) break;
		
		for(int i = 0; i < 2; i++){
			int ny = y + dy[i], nx = x + dx[i];
			// cout<<"y = "<<y<<" x = "<<x<<endl;

			// cout<<"ny = "<<ny<<" nx = "<<nx<<endl;
			
			if(ny >= H || ny < 0 || nx >= W || nx < 0) continue;
			
			int td = 0;
			
			if(a[ny][nx] == 'k') {
				// cout<<"<><> "<<endl;
				td = d1 + ny + nx + 1;
			} else {
				td = d1 + 1;
			}
			
			// cout<<"td = "<<td<<" dis "<<dis[ny][nx]<<endl;
			
			if(dis[ny][nx] > td) {
				dis[ny][nx] = td;
				Q.push({{td,0},{ny,nx}});
			}
		}
		// cout<<endl;
	}
	
	// cout<<dis[0][0]<<endl;
	// cout<<dis[0][1]<<endl;
	// cout<<dis[1][0]<<endl;
	// cout<<dis[1][1]<<endl;
	
	cout<<dis[H-1][W-1]<<endl;
	
	return 0;
}