import java.util.Scanner;

public class Main{
    public static void main(String[] args){

        Scanner  sc = new Scanner(System.in);

        int x = sc.nextInt();
        int y = sc.nextInt();

        if(y<x) {
            int t=0;
            t=y;    y=x;    x=t;
        }
        int z = 0;
        for(int i=0;;i++){
            z = y % x;
            if(z==0){
                System.out.println(x);
                break;
            }else{
                y = x;  x = z;
            }

        }
            
        
    }
}

/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