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());

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

  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);
  }
}