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();
        int r;
        while(true){
            if(x >= y){
                r = x % y;
                if(r == 0){
                    System.out.println(y);
                    break;
                }
                x = y;
                y = r;
            }else{
                r = y % x;
                if(r == 0){
                    System.out.println(x);
                    break;
                }
                y = x;
                x = r;
            }
        }
        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