import java.io.*;
import java.util.*;

public class Main {

    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));    
    private static StringTokenizer st;

    public static void main ( String [] args ) throws IOException
    {
	new Main().cal();
    }

 
    private void cal() throws IOException 
    {
	st = new StringTokenizer(br.readLine());
	int a = Integer.parseInt(st.nextToken());
	int b = Integer.parseInt(st.nextToken());

	int x, y;
	if ( a > b ) {
	    x = a; y = b;
	} else {
	    x = b; y = a;
	}

	while( y > 0 ) {
	    int temp = x;
	    x = y;
	    y = temp % y;
	}

	System.out.println(x);

	
	

    }

}
/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