H, W = map(int,input().split())
P = [input() for k in range(H)]
G = [[0 for k in range(W)] for l in range(H)]

for x in range(1,W):
    if P[0][x] == "k":
        G[0][x] = G[0][x-1] + 1 + x
    else:
        G[0][x] = G[0][x-1] + 1

for y in range(1,H):
    if P[y][0] == "k":
        G[y][0] = G[y-1][0] + 1 + y
    else:
        G[y][0] = G[y-1][0] + 1



for y in range(1,H):
    for x in range(1,W):
        if P[y][x] == "k":
            G[y][x] = min(G[y][x-1]+(y+x)+1,G[y-1][x]+(y+x)+1)
        else:
            G[y][x] = min(G[y][x-1]+1,G[y-1][x]+1)

print(G[H-1][W-1])