import java.util.Scanner;

class Main {

    public static void main(String[] args){

        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt(), b = sc.nextInt();

        while(a!=0 && b!=0) // until either one of them is 0
        {
            int c = b;
            b = a%b;
            a = c;
        }

        System.out.println(a + 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