#include <cstdio>
#include <cstring>

#define NMAX 17

using namespace std;

int Viz[NMAX][NMAX], v[NMAX];
int Ans, n;
char a[NMAX][NMAX];
int ok;

bool verif(int k){
    memset(Viz, 0, sizeof(Viz));
    for(int i = 1; i <= n; ++i)
        for(int j = 1; j <= n; ++j)
            if(a[i][j] == '1')
                Viz[v[i]][v[j]] = 1;
    for(int i = 1; i <= ok; ++i)
        for(int j = 1; j <= ok; ++j)
            if(i != j && Viz[i][j] == 0)
                return 0;
    return 1;
}

void back(int k){
    if(k > n){
        if(ok > 1 && verif(k) == 1)
            ++Ans;
    }
    else{
        for(int i = 1; i <= ok; ++i){
            v[k] = i;
            back(k + 1);
        }
        ++ok;
        v[k] = ok;
        back(k + 1);
        --ok;
    }
}

int main(){
    freopen("copii.in", "r", stdin);
    freopen("copii.out", "w", stdout);
    scanf("%d\n", &n);
    for(int i = 1; i <= n; ++i)
        gets(a[i] + 1);
    back(1);
    printf("%d", Ans);
    return 0;
}