#include <iostream>
using namespace std;
#include <string>

int main()
{
	string name = "";
	string ID = "";
	float answer1;
	float answer2;
	float answer3;
	float answer4;
	float answer5;
	float answer6;
	float answer7;
	float answer8;
	float answer9;
	float answer10;
	float answer11;
	float answer12;
	float answer13;
	float answer14;
	float answer15;
	float answer16;
	float answer17;
	float answer18;
	float answer19;
	float answer20;
	double score = 0;
	cout << "Insert student's name. " << endl;
	cin >> name;
	cout << "Insert student's ID number. " << endl;
	cin >> ID;
	cout << "Insert the student's first answer. t for True, f for False. ";
	cin >> answer1;
	cout << "Insert answer 2. " << endl;
	cin >> answer2;
	cout << "Insert answer 3. " << endl;
	cin >> answer3;
	cout << "Insert answer 4. " << endl;
	cin >> answer4;
	cout << "Insert answer 5. " << endl;
	cin >> answer5;
	cout << "Insert answer 6. " << endl;
	cin >> answer6;
	cout << "Insert answer 7. " << endl;
	cin >> answer7;
	cout << "Insert answer 8. " << endl;
	cin >> answer8;
	cout << "Insert answer 9. " << endl;
	cin >> answer9;
	cout << "Insert answer 10. " << endl;
	cin >> answer10;
	cout << "Insert answer 11. " << endl;
	cin >> answer11;
	cout << "Insert answer 12. " << endl;
	cin >> answer12;
	cout << "Insert answer 13. " << endl;
	cin >> answer13;
	cout << "Insert answer 14. " << endl;
	cin >> answer14;
	cout << "Insert answer 15. " << endl;
	cin >> answer15;
	cout << "Insert answer 16. " << endl;
	cin >> answer16;
	cout << "Insert answer 17. " << endl;
	cin >> answer17;
	cout << "Insert answer 18. " << endl;
	cin >> answer18;
	cout << "Insert answer 19. " << endl;
	cin >> answer19;
	cout << "Insert answer 20. " << endl;
	cin >> answer20;

	if (answer1 == 't')
	{
		score = score + 2;
	}
	else if (answer1 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer2 == 't')
	{
		score = score + 2;
	}
	else if (answer2 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer3 == 't')
	{
		score = score + 2;
	}
	else if (answer3 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer4 == 't')
	{
		score = score + 2;
	}
	else if (answer4 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer5 == 't')
	{
		score = score + 2;
	}
	else if (answer5 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer6 == 't')
	{
		score = score + 2;
	}
	else if (answer6 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer7 == 't')
	{
		score = score + 2;
	}
	else if (answer7 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer8 == 't')
	{
		score = score + 2;
	}
	else if (answer8 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer9 == 't')
	{
		score = score + 2;
	}
	else if (answer9 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer10 == 't')
	{
		score = score + 2;
	}
	else if (answer10 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer11 == 't')
	{
		score = score + 2;
	}
	else if (answer11 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer12 == 't')
	{
		score = score + 2;
	}
	else if (answer12 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer13 == 't')
	{
		score = score + 2;
	}
	else if (answer13 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer14 == 't')
	{
		score = score + 2;
	}
	else if (answer14 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}

	if (answer15 == 't')
	{
		score = score + 2;
	}
	else if (answer15 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer16 == 't')
	{
		score = score + 2;
	}
	else if (answer16 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer17 == 't')
	{
		score = score + 2;
	}
	else if (answer17 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}



	if (answer18 == 't')
	{
		score = score + 2;
	}
	else if (answer18 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}

	if (answer19 == 't')
	{
		score = score + 2;
	}
	else if (answer19 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	if (answer20 == 't')
	{
		score = score + 2;
	}
	else if (answer20 == 'f')
	{
		score = score - 1;
	}
	else
	{
		score = score;
	}


	cout << score;
	return 0;
}