import java.io.*;

public class Main{
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] line = br.readLine().split(" ");
        int x = Integer.parseInt(line[0]);
        int y = Integer.parseInt(line[1]);

        do{
            if(x > y){
                int tmp = x;
                x = y;
                y = tmp % y;
            }else if(x < y){
                int tmp = y;
                y = x;
                x = tmp;
            }else{
                break;
            }
        }while(x % y != 0);

        System.out.println(y);
    }
}
/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