H, W = list(map(int, input().split()))
a_list = [[s for s in input()] for i in range(H)]

dp_list = [[0 for i in range(W)] for j in range(H)]

for h in range(H):
    for w in range(W):
        if h > 0 and w > 0:
            dp_list[h][w] = min([dp_list[h - 1][w], dp_list[h][w - 1]])
            dp_list[h][w] += (1 + h + w) if a_list[h][w] == "k" else 1
        elif h > 0:
            dp_list[h][w] = dp_list[h - 1][w]
            dp_list[h][w] += (1 + h + w) if a_list[h][w] == "k" else 1
        elif w > 0:
            dp_list[h][w] = dp_list[h][w - 1]
            dp_list[h][w] += (1 + h + w) if a_list[h][w] == "k" else 1
        else:
            continue
print(dp_list[-1][-1])