H, W = map(int, input().split())
A = ['o'.join(input()).split('o') for i in range(H)]
dp = [[0 for i in range(W)] for j in range(H)]

for i in range(1, H + W - 1):
    for j in range(i + 1):
        if i - j >= W or j >= H:
            continue
            
        if j == 0:
            if A[j][i - j] == 'k':
                dp[j][i - j] = dp[j][i - j - 1] + i - j + 1
            else:
                dp[j][i - j] = dp[j][i - j - 1] + 1
                
        elif j == i:
            if A[j][i - j] == 'k':
                dp[j][i - j] = dp[j - 1][i - j] + j + 1
            else:
                dp[j][i - j] = dp[j - 1][i - j] + 1
        
        else:
            if A[j][i - j] == 'k':
                dp[j][i - j] = min(dp[j][i - j - 1], dp[j - 1][i - j]) + i + 1
            else:
                dp[j][i - j] = min(dp[j][i - j - 1], dp[j - 1][i - j]) + 1

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