#include <fstream>

using namespace std;
ifstream cin ("copii.in");
ofstream cout ("copii.out");
struct ura{
    char vv[15];
};
ura v[15];
int m, cnt = 0;
int a[15][15];
int e[15];
int check(int n)
{
    int i, j, ok = 1;
    if (n == 1)
        return 0;
    for (i = 1; i <= m; i++)
        for (j = 1; j <= m; j++)
            if (v[i].vv[j] == '1')
            {
                a[e[i]][e[j]] = 1;
                //a[e[j]][e[i]] = 1;
            }
    for (i = 1; i <= n; i++)
        for (j = i + 1; j <= n; j++)
        {
            if (a[i][j] == 0)
                ok = 0;
            a[i][j] = a[j][i] = 0;
        }
    return ok;
}
void bkt(int k, int n)
{
    if (k == m + 1)
        cnt += check(n);
    else
    {
        for (int i = 1; i <= n + 1; i++)
        {
            e[k] = i;
            if (i == n + 1)
                bkt(k + 1, n + 1);
            else
                bkt(k + 1, n);
        }
    }
}

int main()
{
    cin >> m;
    for (int i = 1; i <= m; i++)
        cin >> v[i].vv + 1;
    bkt(1, 0);
    cout << cnt;
    return 0;
}