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

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

//		 int n = Integer.parseInt(in.readLine());
		
		 String[] xy = in.readLine().split(" ");

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

		 
		 int tmp;
		 while(y!=0){
			 
			 tmp=x%y;
			 x=y;
			 y=tmp;
			 
		 }
		 
		 System.out.println(x);
		
	}
}
/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