


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main{
  public static void main(String args[]) throws IOException{
   BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

   String[] string =  br.readLine().split(" ");

   int x = Integer.parseInt( string[0] );
   int y = Integer.parseInt( string[1] );

   int tmp;

   if(x < y){

	   tmp = x;
	   x = y;
	   y = tmp;

   }

   int r = x % y;
   while(r!=0){
     x = y;
     y = r;
	 r = x % y;
   }

   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