import java.util.*;
import java.math.BigDecimal;

public class SumMultiply {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);

    BigDecimal a = new BigDecimal(sc.next());
    BigDecimal b = new BigDecimal(sc.next());

    BigDecimal c = a.add(b);
    BigDecimal d = a.multiply(b);

    if (c.compareTo(d) == -1){
      System.out.println(gcd(d,c));
    }else{
      System.out.println(gcd(c,d));
    }
  }

  public static long gcd(BigDecimal bigNum, BigDecimal smallNum) {
    BigDecimal remainder = bigNum.remainder(smallNum);
    if (remainder.compareTo(new BigDecimal(0)) == 0){
      return smallNum.longValue();
    }
    return gcd(smallNum, remainder);
  }
}