#include<bits/stdc++.h>
using namespace std;
using ll=long long;

int main(){
	ios::sync_with_stdio(false);
    cin.tie(nullptr);

    ll N;
    cin>>N;
    vector<array<ll,2>> WB,BW;
    for(int i=0;i<N;i++){
        string S;
        cin>>S;
        for(int j=0;j<N;j++){
            if(S[j]=='#')BW.push_back({i,j});
            if(S[j+N]=='.')WB.push_back({i,j+N});
        }
    }
    ll an=0;
    for(int i=0;i<BW.size();i++){
        ll dx=abs(BW[i][0]-WB[i][0]);
        ll dy=abs(BW[i][1]-WB[i][1]);
        an+=dx+dy;
    }
    cout<<an<<"\n";
}