import java.io.IOException;
import java.io.InputStreamReader;
import java.io.BufferedReader;

public class Main{
    
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        String[] input = br.readLine().split(" ");
        int a = Integer.valueOf(input[0]);
        int b = Integer.parseInt(input[1]);

        System.out.println(gcd(a,b));

    }

    private static int gcd(int a , int b){
        int result = 1;

        if(b > a){
            int tmp = b;
            b = a;
            a = tmp;
        }

        if((a % b) == 0) return b;
        else return gcd(b , a%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