#include <iostream>
using namespace std;
int dp[2000][2000];
int main(){
    int h,w;cin>>h>>w;
    char mp[h][w];
    for(int i = 0; h > i; i++){
        for(int j = 0; w > j; j++){
            cin>>mp[i][j];
        }
    }
    dp[0][0] = 0;
    for(int i = 0; h > i; i++){
        for(int j = 0; w > j; j++){
            if(!(i+j))continue;
            if(!i){
                dp[i][j] = dp[i][j-1]+1;
            }else if(!j){
                dp[i][j] = dp[i-1][j]+1;
            }else{
                dp[i][j] = min(dp[i-1][j],dp[i][j-1])+1;
            }
            if(mp[i][j] == 'k')dp[i][j]*=2;
        }
    }
    cout << dp[h-1][w-1] << endl;
}