import java.util.Scanner;

public class Main {

    public static int Max;

    public static void main(String[] args)
    {
        Scanner scan =new Scanner(System.in);
	    int x=scan.nextInt();
        int y=scan.nextInt();

        Common_Divisir(x,y);

        System.out.println(Max);
    }

    public static void Common_Divisir(int a, int b)
    {
        int c=a%b;
        if(c!=0){
            a=b;
            b=c;
            Common_Divisir(a,b);
        }
        if(c==0){
            Max=b;
        }
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz