// No.1656 Recuperation
package main

import "fmt"

func main() {
	var t int
	fmt.Scan(&t)

	type ca struct {
		a   int
		b   int
		ans int
	}
	cases := make([]ca, t)
	for i := 0; i < t; i++ {
		fmt.Scan(&cases[i].a, &cases[i].b)
		cases[i].ans = cases[i].b + (cases[i].a * cases[i].b)
	}

	for _, c := range cases {
		fmt.Println(c.ans)
	}
}