package main

import . "fmt"
import . "os"
import bf "bufio"
import . "math/big"

func main() {
	rd:=bf.NewReader(Stdin)
	wr:=bf.NewWriter(Stdout)
	defer wr.Flush()
	
	ds := []*Int{}
	for i, d := 0, 1; i <= 10; i, d = i+1, d*10 {
		ds = append(ds, NewInt(int64(d)))
	}
	
	var t int
	Fscan(rd,&t)
	for ; t>0; t-- {
		var n int
		Fscan(rd,&n)
		x := NewInt(1)
		for i := 0; i < n; i++ {
			var s string
			Fscan(rd,&s)
			if i == 0 {
				continue
			}
			var a Int
			Sscan(s, &a)
			d := ds[len(s)]
			g := new(Int).GCD(nil,nil,&a,d)
			g.Div(d, g)
			x.Mul(x, g.Div(g, new(Int).GCD(nil,nil,x,g)))
		}
		Fprintln(wr, x)
	}
}