import java.util.*;
public class Main {
    public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
    	int n=sc.nextInt();
        int m =sc.nextInt();
        int r;
        for(;;){
            r=n%m;
            if(r==0){
            	System.out.println(m);
            	break;
            }
            n=m;
            m=r;
        }

    }
}

/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