H,W=map(int,input().split())
A=[input() for h in range(H)]
inf=1<<30
dp=[[inf]*W for h in range(H)]
dp[0][0]=0
for h in range(H):
    for w in range(W):
        if h:
            dp[h][w]=min(dp[h][w],dp[h-1][w]+1)
        if w:
            dp[h][w]=min(dp[h][w],dp[h][w-1]+1)
        if A[h][w]=="k":
            dp[h][w]+=h+w
ans=dp[H-1][W-1]
print(ans)