import java.util.*;

class Main {
    public static void main(String args[]) {
            Scanner sc = new Scanner(System.in);
            System.out.println(gcd(sc.nextInt(), sc.nextInt()));
            sc.close();
    }
    public static int gcd(int a, int b) {
        if (a < b) {
            return gcd(b, a);
        }
        if (b == 0) {
            return a;
        }
        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