import java.util.Scanner;

/**
 * @author kawakami
 *
 */
class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		StringBuilder sb = new StringBuilder();
		Scanner as = new Scanner(System.in);
		
		int x,y,ama;
		int i = 0;
		int big = 0;
		int sma = 0;
		
		x = Integer.parseInt(as.next());
		y = Integer.parseInt(as.next());
		
		if(x > y){
			
			big = x;
			sma = y;
	
		}
		else{
			
			big = y;
			sma = x;
			
		}
		
		ama = big % sma;
		if(ama == 0){
			
			i = sma;
			
		}
		else{
			for(i=ama;i>=1;i--){
				
				if(ama % i == 0 && sma % i == 0){
					
					break;
					
				}
				
			}
		
		}
		if(i != 0){
			
			sb.append(String.valueOf(i));
		
		}
		else{
			
			sb.append(String.valueOf(1));
			
		}
		
		System.out.println(sb.toString());
	}

}
/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