import java.util.*;

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