import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try(Scanner sc = new Scanner(System.in)) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            do {
                int c = a % b;
                a = b;
                b = c;
            } while(b != 0);
            System.out.println(a);
        }
    }
}

/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