#######################################################
# coding: utf-8
# Your code here!
import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline
read = sys.stdin.read

#n,m,*d= [int(i) for i in read().split()]

#a,t,k = [int(i) for i in readline().split()]

h,w = [int(i) for i in readline().split()]
bbb = read().split()
b = [[i+j+1 if bij=="k" else 1 for j,bij in enumerate(bi)] for i,bi in enumerate(bbb)]
b[0][0] = 0
INF = 10**9

dp = [0]+[INF]*(w-1)
for bi in b:
    for j, bij in enumerate(bi):
        if j:
            dp[j] = min(dp[j],dp[j-1]) + bij
        else:
            dp[j] += bij
    

print(dp[-1])