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

public class Main {
    static void gcd(int a, int b){
            int x = Math.max(a,b);
            int y = Math.min(a,b);
            int t = 0;
            while (y>0){
                t = x;
                x = y;
                y = t%y;
            }
            System.out.println(x);
    }
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] line = br.readLine().split(" ");
        int a = Integer.parseInt(line[0]);
        int b = Integer.parseInt(line[1]);
        int ans = 0;
        gcd(a,b);
    }
}
/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