import java.util.Scanner;

public class Main {
    public static void main(String[] args ){
        Scanner scanner = new Scanner(System.in);
        int x = scanner.nextInt();
        int y = scanner.nextInt();

        System.out.println(gcd(x, y));
    }

    public static int gcd(int x, int y){
        int X = x, Y = y;
        if(X < Y) {
            X = y;
            Y = x;
        }
        if(X % Y == 0)
            return Y;
        else
            return gcd(Y, 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