import sys
input=lambda: sys.stdin.readline().rstrip()
h,w=map(int,input().split())
A=[input() for _ in range(h)]
inf=float("inf")
D=[[inf]*w for _ in range(h)]

for i in range(h):
  for j in range(w):
    if i==0 and j==0:
      D[i][j]=0
    elif i==0:
      D[i][j]=D[i][j-1]+1
    elif j==0:
      D[i][j]=D[i-1][j]+1    
    else:
      D[i][j]=min(D[i][j-1],D[i-1][j])+1
    if A[i][j]=="k":
      D[i][j]+=i+j     
print(D[-1][-1])