from collections import*
n=int(input())
s=[[*input()]for _ in range(n)]
ans=0
q=deque()
for i in range(n):
  pj=0
  for j in range(2*n):
    if s[i][j]=='.':
      if pj<n:
        ans+=abs(j-pj)
        s[i][j]='#'
        s[i][pj]='.'
      else:
        q+=(i,j),
      pj+=1
for i in range(n):
  for j in range(n):
    if s[i][j]=='#':
      pi,pj=q.popleft()
      ans+=abs(i-pi)+abs(j-pj)
      s[i][j]='.'
      s[pi][pj]='#'
print(ans)