H, W = list(map(int, input().split()))
a_list = [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]]) + \
                ((1 + h + w) if a_list[h][w] == "k" else 1)
        elif h > 0:
            dp_list[h][w] = dp_list[h - 1][w] + ((1 + h + w) if a_list[h][w] == "k" else 1)
        elif w > 0:
            dp_list[h][w] = dp_list[h][w - 1] + ((1 + h + w) if a_list[h][w] == "k" else 1)
        else:
            continue
print(dp_list[-1][-1])