INF = 10 ** 7
import sys
input = sys.stdin.readline
sys.setrecursionlimit(100000000)
dy = (-1,0,1,0)
dx = (0,1,0,-1)
from collections import deque

def main():
    h,w = map(int,input().split())
    grid = [list(input()) for _ in range(h)]

    q = deque()
    q.append((0,0))
    dist = [[INF] * w for _ in range(h)]
    dist[0][0] = 0
    while q:
        i,j = q.popleft()
        for k in range(4):
            y = i + dy[k]
            x = j + dx[k]
            if y < 0 or y >= h:
                continue
            if x < 0 or x >= w:
                continue
            if grid[y][x] == 'k':
                if dist[y][x] > dist[i][j] + 1 + y + x:
                    dist[y][x] = dist[i][j] + 1 + y + x
                    q.append((y,x))
            else:
                if dist[y][x] > dist[i][j] + 1:
                    dist[y][x] = dist[i][j] + 1
                    q.append((y,x))
    
    print(dist[-1][-1]) 
if __name__ == '__main__':
    main()