import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int x= sc.nextInt();
        int y= sc.nextInt();
        while(true){
            if(x>=y){
                x%=y;
            }else{
                y%=x;
            }
            if(x*y==0){
                break;
            }
        }
        System.out.println(x+y);
        sc.close();
    }
}

/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