#include <iostream>

#include <iomanip>

#include <stdlib.h>

#include <time.h>

#include <string>

using namespace std;



int main()

{

	int x, die;

	string roll, tmp;

      

	srand(time(0));    


	while(true) {

		cout << "What die do you want to use (6, 20 or 100)? ";
		cin >> die;

		if (cin.fail() || (die != 6 && die != 20 && die != 100)) {
			cin.clear();
			getline(cin, tmp);
			cout << "Invalid die type, please try again." << endl << endl;
			continue;
		}
        cout << endl;
        cout << "How many dices do you want to roll? ";
        cin >> x;
        cout << endl;
        
		cout << "Type 'roll' to roll the die: ";
		cin >> roll;

		if (cin.fail() || roll != "roll") {
			cin.clear();
			getline(cin, tmp);
			cout << "Invalid command, please try again." << endl << endl;
			continue;
		}

        if(x>=2)
        {
                cout << "You rolled: " << x << "d" << die << "= " << rand() % die + 1 * x;
                cout << endl << endl;
                }     
        if (x<=1)
        {
		cout << "You rolled: " << rand() % die + 1;

		cout << endl << endl;
             }
	}

	return 0;

}