#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
int arr[8] = { 2, 3, 5, 7, 11, 13, 17, 19 };
double a[8][8];
int mc, k;
double ret;
int solve(int u, double sum, int chack){
    if (chack == mc){
        ret = min(ret, sum);
        return 0;
    }
    for (int i = 0; i < k; i++){
        if (chack%arr[i] != 0){
            solve(i, sum + a[u][i], chack*arr[i]);
        }
    }

}
int main(){
    int t;
    ret = 14150;
    cin >> t;
    while(t--){
        cin >> k;
        mc = 1;
        for (int i = 0; i < k; i++){
            mc *= arr[i];
        }
        for (int i = 0; i < k; i++)
        {
            for (int j = 0; j < k; j++){
                cin >> a[i][j];
            }
        }
        for (int i = 0; i < k; i++)
            solve(i, 0, arr[i]);
        printf("%.10f\n", ret);
    }

    return 0;
}