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 c;
	while(!(a==b)){
		if(a<b){
			c=b-a;
			b=c;
		}else{
			c=a-b;
			a=c;
		}
	}
	System.out.println(a);
}
}


/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