/* ALDS1_1_B */
import java.io.*;

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

      System.out.println(GCD(x, y));

    }catch(Exception e){
      System.out.println(e);
    }
  }

  public static int GCD(int x, int y)
  {
    int gcd;
    if(x % y == 0){
      gcd = y;
    }else {
      gcd = GCD(y, (x % y));
    }

    return gcd;
  }
}
/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