#include <fstream>
#include <cstring>

using namespace std;

const int N=12;
char a[N][N];
int b[N], vv[N][N], n, nr, sol;

int verif()
{
    int i, j;
    memset(vv, 0, sizeof(vv));
    for(i=1;i<=n;++i)
    {
        for(j=1;j<=n;++j)
        {
            if(a[i][j]) vv[b[i]][b[j]]=1;
        }
    }

    for(i=1;i<=nr;++i)
    {
        for(j=1;j<=nr;++j)
        {
            if(i!=j&&!vv[i][j]) return 0;
        }
    }
    return 1;
}

void bt(int k)
{
    if(k==n+1)
    {
        sol+=verif();
        return;
    }
    for(int i=1;i<=nr;++i)
    {
        b[k]=i;
        bt(k+1);
    }
    b[k]=++nr;
    bt(k+1);
    --nr;
}

int main()
{
    FILE *in = fopen("copii.in","r");
    FILE *out = fopen ("copii.out","w");
    int i, j;
    fscanf(in,"%d",&n);
    for(i=1;i<=n;++i)
    {
        fscanf(in,"%s",&a[i]+1);
        for(j=1;j<=n;++j) a[i][j]-='0';
    }
    bt(1);
    fprintf(out,"%d\n",sol-1);
    fclose(in);
    fclose(out);
    return 0;
}