from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    H, W = map(int, input().split())
    A = stdin.read().splitlines()

    grid = [[0] * W for _ in [0] * H]
    for i in range(1, W):
        grid[0][i] = grid[0][i-1] + 1
        if A[0][i] == 'k':
            grid[0][i] *= 2
    for i in range(1, H):
        grid[i][0] = grid[i-1][0] + 1
        if A[i][0] == 'k':
            grid[i][0] *= 2
    for i in range(1, H):
        for j in range(1, W):
            grid[i][j] = min(grid[i][j-1] + 1, grid[i-1][j] + 1)
            if A[i][j] == 'k':
                grid[i][j] *= 2
    print(grid[H-1][W-1])


main()