import java.util.*;
import java.util.Scanner;

public class Main {
    public static void main (String args[]) {
        // input

        int a;
        int b;

        Scanner inp = new Scanner(System.in);

        a = inp.nextInt();

        b = inp.nextInt();

       while (b != 0) {
           int temp = a;
           a = b;
           b = temp%b;
       }

       System.out.println(a);
    }
}

/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