#include<bits/stdc++.h>
#define ll long long
#define un unsigned
#define int long long
#define db double
#define inf 1000000000000000
#define st string
#define ct const
#define xh(a,b,c) for(int a=b;a<=c;a++)
#define wx while(1)
#define dn(a,b,c) for(int a=b;a>=c;a--)
using namespace std;
ll max(ll x,ll y){
   return x>y?x:y;
}
ll min(ll x,ll y){
   return x<y?x:y;
}
int n;
char a[40][40];
bool f[40][40];
int ans;
int tx[]={0,0,-1,1};
int ty[]={1,-1,0,0};
void dfs(int x,int y){
	f[x][y]=1;
	xh(i,0,3){
		int X=x+tx[i],Y=y+ty[i];
		if(!f[X][Y]&&a[X][Y]=='.')dfs(X,Y);
	}
}
signed main(){
	cin>>n;
	xh(i,1,n)xh(j,1,n)cin>>a[i][j];
	dfs(1,1);
	xh(i,1,n){
		xh(j,1,n){
			if(!f[i][j])continue;
			xh(i1,0,3){
				int X=i+tx[i1],Y=j+ty[i1];
				if(a[X][Y]=='#'||!X||X==n+1||!Y||Y==n+1)ans++;
			}
		}
	}
	cout<<(ans-4)*9;
	return 0;
}

后记：楼下这位，不许ctj!!!!!

//今天不吃蛆 吃tj！！！
#include<bits/stdc++.h>
#define f(i,l,r) for(int i=l;i<=r;i++)
#define fx(i,l,r) for(int i=l;i<r;i++)
using namespace std;
int n;
char a[105][105];
bool b[105][105],c[105][105],d[105][105];
int ans;
bool yuejie(int x,int y){
	if(x>=0&&x<=n&&y>=0&&y<=n) return 1;
	return 0;
}
void dfs(int x,int y){
	if(b[x][y]||!yuejie(x,y)) return;
	b[x][y]=1;
	if(a[x][y]=='#'){
		c[x][y]=1;return;
	}
	dfs(x-1,y);dfs(x,y-1);
	dfs(x,y+1);dfs(x+1,y);
	return;
}
void z(int x,int y){
	if(yuejie(x-1,y)&&a[x-1][y]=='.'&&b[x-1][y]) ans++;
	if(yuejie(x,y-1)&&a[x][y-1]=='.'&&b[x][y-1]) ans++;
	if(yuejie(x,y+1)&&a[x][y+1]=='.'&&b[x][y+1]) ans++;
	if(yuejie(x+1,y)&&a[x+1][y]=='.'&&b[x+1][y]) ans++;
	return;
}
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	cin>>n;
	f(i,1,n){
		cin>>a[i];
		for(int j=n;j>=1;j--){
			a[i][j]=a[i][j-1];
		}
		a[i][0]=' ';
	}
	f(i,2,n+1){
		a[i][0]='#';
	}
	f(i,0,n-1){
		a[i][n+1]='#';
	}
	f(j,1,n){
		if(j!=1) a[0][j]='#';
		if(j!=n) a[n+1][j]='#';
	}
	n++;
	dfs(1,1);dfs(n,n);
	f(i,0,n){
		f(j,0,n){
			if(c[i][j]==1) z(i,j);
		}
	}
	cout<<ans*9;
}

//搜一下终点和终点，dfs即可
#include<bits/stdc++.h>
#define f(i,l,r) for(int i=l;i<=r;i++)
#define fx(i,l,r) for(int i=l;i<r;i++)
using namespace std;
int n;
char a[105][105];
bool b[105][105],c[105][105],d[105][105];
int ans;
bool yuejie(int x,int y){
	if(x>=0&&x<=n&&y>=0&&y<=n) return 1;
	return 0;
}
void dfs(int x,int y){
	if(b[x][y]||!yuejie(x,y)) return;
	b[x][y]=1;
	if(a[x][y]=='#'){
		c[x][y]=1;return;
	}
	dfs(x-1,y);dfs(x,y-1);
	dfs(x,y+1);dfs(x+1,y);
	return;
}
void z(int x,int y){
	if(yuejie(x-1,y)&&a[x-1][y]=='.'&&b[x-1][y]) ans++;
	if(yuejie(x,y-1)&&a[x][y-1]=='.'&&b[x][y-1]) ans++;
	if(yuejie(x,y+1)&&a[x][y+1]=='.'&&b[x][y+1]) ans++;
	if(yuejie(x+1,y)&&a[x+1][y]=='.'&&b[x+1][y]) ans++;
	return;
}
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	cin>>n;
	f(i,1,n){
		cin>>a[i];
		for(int j=n;j>=1;j--){
			a[i][j]=a[i][j-1];
		}
		a[i][0]=' ';
	}
	f(i,2,n+1){
		a[i][0]='#';
	}
	f(i,0,n-1){
		a[i][n+1]='#';
	}
	f(j,1,n){
		if(j!=1) a[0][j]='#';
		if(j!=n) a[n+1][j]='#';
	}
	/*f(i,0,n+1){
		f(j,0,n+1){
			cout<<a[i][j];
		}
		cout<<endl;
	}*/
	n++;
	dfs(1,1);dfs(n,n);
	f(i,0,n){
		f(j,0,n){
			if(c[i][j]==1) z(i,j);
		}
	}
	cout<<ans*9;
	return 0;
}