import java.util.*;

public class Main {

    static void swap(int a, int b) {
        int tmp = a;
        a = b;
        b = tmp;
    }

    static int gcd(int x, int y) {
        if(x % y == 0) return y;
        else return gcd(y, x % y);
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int y = sc.nextInt();
        if(x < y) swap(x, y);
        System.out.println(gcd(x, y));
    }
}

/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