import java.util.Scanner;

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);
		
		for (int mod = x % y; mod != 0; x = y, y = mod, mod = x % y) {
			
		}
		
    	System.out.println(y);
    	
        sc.close();
	}
}
/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