package main
import (
  "bufio"
  "fmt"
  _ "math"
  "math/big"
  "os"
  _ "strconv"
  "strings"
)

func main() {
  scanner := bufio.NewScanner(os.Stdin)
  holder := []big.Int{}
  th := 0
  for scanner.Scan() {
    th += 1
    text := scanner.Text()
    for _, x2 := range strings.Split(text, " ") {
      bigint := *big.NewInt(0)
      bigint.SetString(x2, 10)
      holder = append(holder, bigint)
    }
    if th == 1 {
      break
    }
  }
  a, b := holder[0], holder[1]
  op_sum, op_mul := big.NewInt(0), big.NewInt(0)
  op_sum.Add(&a, &b)
  op_mul.Mul(&a, &b)
  fmt.Println(new(big.Int).GCD(nil, nil, op_sum, op_mul))
}