import java.util.Scanner;

public class Main{

	public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
            int a = in.nextInt();
            int b = in.nextInt();
            in.close();
            System.out.println(Function(a, b));
            
            
            
	}
	public static int Function(int a, int b) {
		if(b != 0)
			return Function(b, a % b);
		else
			return 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