import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner num = new Scanner(System.in);
        int x = num.nextInt();
        int y = num.nextInt();
        int result = 0;

        if(x < y) {
            int t = x;
            x = y;
            y = t;
        }

        while(true) {
            int z = x % y;
            x = y;
            y = z;
            if(y == 0) {
                System.out.println(x);
                break;
            }
        }
        
    }
}

/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