import java.util.Scanner;

public class Main {

  public static void main(String[] args) {
    Scanner stdIn = new Scanner(System.in);
    int x = stdIn.nextInt();
    int y = stdIn.nextInt();

    if (x < y) {
      int t = x;
      x = y;
      y = t;
    }
    x = x % y;

    while (x != 0) {
      int t = x;
      x = y;
      y = t;
      x = x % y;
    }

    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