import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int x = Math.max(a, b);
    int y = Math.min(a, b);
    boolean equal = true;
    if(x == y) {
      System.out.println(x);
      equal = false;
    }
    x %= y;
    int max = 0;
    for(int i = Math.min(x, y); i > 0; i--) {
      if(x % i == 0 && y % i == 0) {
        max = i;
        break;
      }
    }
    if(equal) {
      System.out.println(max);
    }
  }
}


/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