import java.io.*;
public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader buf=new BufferedReader(new InputStreamReader(System.in));
        String[] str=buf.readLine().split(" ");
        
        int x=Integer.parseInt(str[0]);
        int y=Integer.parseInt(str[1]);
        int ans=0,flg=1;
        if(x==y){
            System.out.println(x);
            flg=0;
        }
        while(flg==1){
            ans=x%y;
            x=y;
            y=ans;
            if(x%y==0){
                System.out.println(ans);break;
            }
        }
    }
}
/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