import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main{

	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		//BufferedReader br = new BufferedReader(new FileReader("sample.txt"));
		StringTokenizer stk=new StringTokenizer(br.readLine());
		int a=Integer.parseInt(stk.nextToken());
		int b=Integer.parseInt((String)stk.nextElement());
		System.out.println(yakusuu(a,b));
	}
	static int yakusuu(int a,int b){
		if(a<b){int tmp=a;
			a=b;
			b=tmp;}
		while(a%b!=0){			
			int l=a%b;
			a=b;b=l;}
		return b;
	}

}
/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