Driver.java

import java.io.*;
import java.util.*;

public class Driver {
    public static void main (String[] args) {
	GCD a = new GCD();
	System.out.println (a.GCD2(1000000007,900000199));
	System.out.println (a.isprime(17));
	System.out.println (a.isprime(49));
    }
}