H, W = map(int, input().split())
A = [input() for _ in range(H)]
#A = [input()[:-1] for _ in range(H)]
INF=10**10
dp = [[INF] * W for _ in range(H)]
dp[0][0] = 0

for h in range(H):
    for w in range(W):
        if h+1 < H:
            dp[h+1][w] = min(dp[h+1][w], dp[h][w] + (h+w+1 if A[h][w]=="k" else 1))
        if w+1 < W:
            dp[h][w+1] = min(dp[h][w+1], dp[h][w] + (h+w+1 if A[h][w]=="k" else 1))

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