//************************************************************************
//*???7-1.cpp                                                         
//*???????                                                    
//*??????                                                          
//*???2013?11?4?                                                   
//************************************************************************
int main()
{
	int t[100][100] = {0}, i, j, n, row[2]={0}, col[2]={0};
	cin >> n;
	for(i = 1; i <= n; i++ )
	{
		for(j = 1; j <= n; j++)
		{
			cin >> t[i][j];	                
		}
	}
	for(i = 1; i <= n; i++ )
	{
		for(j = 1; j <= n; j++)
		{
			
			if(t[i][j] == 0 && row[0] == 0)
				row[0] = i;	
			if(t[n - i + 1][j] == 0 && row[1] == 0)
				row[1] = n - i + 1;
			if(t[j][i] == 0 && col[0] == 0)		
				col[0] = i;
			if(t[n - j + 1][n - i + 1] == 0 && col[1] == 0)
			
				col[1] = n - i + 1;													
			
			
		}
	} 
	cout << (row[1] - row[0] - 1) * (col[1] - col[0] - 1) << endl;                          
	return 0;
}