import java.util.Scanner;
 
public class Main {
 
    public static final int BIG_NUM  = 2000000000;
    public static final int MOD  = 1000000007;
 
    public static void main(String[] args) {
 
        Scanner scanner = new Scanner(System.in);
        int x = scanner.nextInt();
        int y = scanner.nextInt();
 
        System.out.println(gcd(Math.max(x, y),Math.min(x, y)));
    }
 
    public static int gcd(int a,int b){
 
        if(b == 0){
            return a;
        }else{
            return gcd(b,a%b);
        }
    }
}

/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