import java.util.Scanner;
class Main {
    public static void main(String[] args){
    	Scanner scan = new Scanner(System.in);
    	int num1 = scan.nextInt();
    	int num2 = scan.nextInt();
    	int x;
    	int y;
    	
    	if(num1 > num2){
    		x = num1;
    		y = num2;
    	}else{
    		x = num2;
    		y = num1;
    	}
    	
    	int tmp;
    	for( ;(tmp = x % y) != 0; ){
    		x = y;
    		y = tmp;
    	}
    	
    	System.out.println(y);
     }
}
/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