import java.util.*;

public class GCD {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter two numbers");
        int a = sc.nextInt();
        int b = sc.nextInt();
        int result = gcd(a, b);
        System.out.println("GCD of " + a + "," + b + " is " + result);
        sc.close();
    }

    private static int gcd(int a, int b) {
        if (b == 0)
            return a;
        return gcd(b, a % b);
    }
}