import sys
input = sys.stdin.readline

N=int(input())
MAP=[input().strip() for i in range(N)]

A=[]
B=[]

for i in range(N):
    for j in range(N):
        if MAP[i][j]=="#":
            A.append((i,j))

for i in range(N):
    for j in range(N,2*N):
        if MAP[i][j]==".":
            B.append((i,j))

ANS=0
for i in range(len(A)):
    a,b=A[i]
    c,d=B[i]
    ANS+=abs(a-c)+abs(b-d)

print(ANS)