import java.io;
import java.util.Random;

public class TwentyGameJava {
	public static void Main(String[] argu) throws IOException{
		
		System.out.println("\n\t\t***Welcome to Twenty Game***");
		System.out.println("\tYou can select 1, 2 or 3 only");
		System.out.println("\tAnd then sum of number is 20 WIN");
		Select();
	}
	public static void Select()
	{
		String s;
		int i;
		System.out.println("\n");
		System.out.println("If you want to go first, push 1:");
		System.out.println("If you want Com to go first, push 2:");
		BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
		s = stdin.readLine();
		i=Integer.parseInt(s);
		switch(i)
		{
				case 1:YouFirst();break;
				case 2:ComFirst();break;
		}
	}
	public static void YouFirst()
	{
		int seq=1,sum=0,c=0,temp;
		String s;
		BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
		do{
			do{
			System.out.println("\n"+seq+". Enter your number: ");
			s=stdin.readLine();
			temp=Integer.parseInt(s);
			}while(temp!=1&&temp!=2&&temp!=3);	
			sum=sum+temp;
			System.out.println("\t\t\t\tsum="+sum+"\n");
			switch(temp)
			{
				case 1:c=3;
				case 2:c=2;
			    	case 3:c=1;
			}
			seq++;
			System.out.println(seq+". Computer select number: "+c);
			sum=sum+c;
			System.out.println("\t\t\t\tsum="+sum);
			seq++;
		}while(sum!=20);
		System.out.println("\n\t\tYou lose!! HaHa");

	}
	public static void ComFirst()
	{
		int seq=1,sum=0,c=0,temp,check,com; 
		String s;
		Random r=new Random();
		BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
		do
		{
			com=(r.nextInt(3))+1;//random is 0 or 1 or 2. so must add 1
			System.out.println(seq+". Computer select number: "+com);
			seq++;
			sum=sum+com;
			System.out.println("\t\t\t\tsum="+sum);
			do{
			System.out.println("\n"+seq+". Enter your number: ");
			s=stdin.readLine();
			temp=Integer.parseInt(s);
			}while(temp!=1&&temp!=2&&temp!=3);
			sum=sum+temp;
			System.out.println("\t\t\t\tsum="+sum+"\n");
			seq++;
			if(sum=20){System.out.println("\t\tYou Win Thank you!!");break;}
			check=sum%4;
		}while(check==0);
		if(sum!=20)
		{
		check=sum%4;
		switch(check)
		{
		case 1:c=3;
		case 2:c=2;
		case 3:c=1;
		}
		do
		{
			System.out.println(seq+". Computer select number: "+c);
			seq++;
			sum=sum+c;
			System.out.println("\t\t\t\tsum="+sum);
			if(sum!=20)
			{
			do{
			System.out.println("\n"+seq+". Enter your number: ");
			s=stdin.readLine();
			temp=Integer.parseInt(s);
			}while(temp!=1&&temp!=2&&temp!=3);
			
			sum=sum+temp;
			System.out.println("\t\t\t\tsum="+sum+"\n");
			seq++;
			}
			switch(temp)
			{
				case 1:c=3;
				case 2:c=2;
			    	case 3:c=1;
			}
		}while(sum!=20);
		System.out.println("\n\t\tYou lose!! HaHa");
		}
	
	}
}