import java.util.*;
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input = new Scanner(System.in);
		int int1 = input.nextInt();
		int int2 = input.nextInt();
		int gcd = 1;
		
		if(int2 > int1) {
			int temp = int1;
			int1 = int2;
			int2 = temp;
		}
		while(int1 >= int2) {
			int temp = int2;
			int2 = int1 % int2;
			if(int2 == 0) {
				gcd = temp;
				break;
			}
			int1 = temp;
		}
		System.out.println(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