import java.util.*;
 
class Main {
    public static void main(String[] args) {
                Scanner sc = new Scanner(System.in);
                int i = sc.nextInt();
                int j = sc.nextInt();
        System.out.println(getGDC(i, j));
    }
 
    private static int getGDC(int i, int j) {
        if (j == 0) return i;
        return getGDC(j, i % j);
    }
}
/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