import java.util.*;

public class Main {
    private static final Scanner scn = new Scanner(System.in);
    
    public static void main(String[] args) {
        int x = scn.nextInt(), y = scn.nextInt();
        System.out.println(euclid(x > y ? x : y, x < y ? x : y));
    }
    
    private static int euclid(int x, int y) {
        if(y > 0) {
            return euclid(y, x % y);
        } else {
            return x;
        }
    }
}
/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