import java.util.*;
public class Main {
	static Scanner sc = new Scanner (System.in);
	public static void main (String[] args) {
		Main calc = new Main(); 
		long a = sc.nextLong();
		long b = sc.nextLong();
		System.out.println(calc.GCF(a, b));
	}	
	public long GCF(long a, long b) {
	    if (b == 0) return a;
	    else return (GCF (b, a % b));
	}
}
/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