C++ :

#include <bits/stdc++.h>
using namespace std;
int r[101], c[101]; // r行, c列 
int main()
{
	int n, ans = 0;
	char ch;
	cin >> n;
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= n; j++)
		{
			cin >> ch;
			if (ch == '*') 
			{
				r[i]++, c[j]++; 
				ans = max(ans, max(r[i], c[j]));
			}
		}
	cout << ans << endl;
	return 0;
}