import java.util.*;
   
class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        
        int x = sc.nextInt();
        int y = sc.nextInt();
        int i;
   
        if(x<=y){
            i = y%x;
            while(i!=0){
                y = x;
                x = i;
                i = y%x;
            }
            System.out.println(x);
        }else{
            i = x%y;
            while(i!=0){
                x = y;
                y = i;
                i = x%y;
            }
            System.out.println(y);
        }
    }
}
/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