import sequtils
import strutils

var T: int = stdin.readLine().parseInt()
var cases: seq[seq[int]]

for t in countup(1, T):
    var tmp = map(stdin.readLine().split(" "), proc(x: string): int = x.parseInt())
    cases.add(tmp)

for c in cases:
    echo(c[1] + (c[0] * c[1]))