import java.util.*;

public class Main{
    public static void main(String[] args){
	Scanner a = new Scanner(System.in);
	int x = a.nextInt();
	int y = a.nextInt();
	int n = x;
	if(x < y){
	    x = y;
	    y = n;
	}
	while(y != 0){
	    n = y;
	    y = x%y;
	    x = n;;
	}
	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