import java.util.Scanner;
public class Main{
    public static void main(String[] args){
	int a,b,hz,rem;
	Scanner scan =new Scanner(System.in);
	a=scan.nextInt();
	b=scan.nextInt();
	if(b>a){
	    hz=a;
	    a=b;
	    b=hz;
	}
	rem=a%b;
        while(rem!=0){
	    a=b;
	    b=rem;
	    rem=a%b;
	}
	System.out.println(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