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

public class Main{

    public static void main(String[] args)throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] t = br.readLine().split(" ");
        int a = Integer.parseInt(t[0]);
        int b = Integer.parseInt(t[1]);
        System.out.println(gcd(a, b));
    }

    public static int  gcd(int x, int y){
        int r;
        if(x < y){
            int temp;
            temp = x;
            x = y;
            y = temp;
        }

        while(y > 0){
            r = x % y;
            x = y;
            y = r;
        }
        return 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