import java.util.Scanner;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        boolean bl = true;
        int x = sc.nextInt();
        int y = sc.nextInt();
        int z;
        while(true) {
            z = x % y;
            x = y;
            y = z;
            if( y == 0){
                break;
            }
        }
        System.out.printf("%d%n", 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