푸키키키

#include <iostream>  

using namespace std;

int main(void)
{
	cout << "|\\_/|" << endl;
	cout << "|q p|   /}" << endl;
	cout << "( 0 )" << '"' << '"' << '"' << '\\' << endl;
	cout << '|'<<'"'<<'^'<<'"'<<'`'<<"    "<<'|' << endl;
	cout << "||_/=\\\\__|" << endl;
	
}
 

#include <iostream>  

using namespace std;

int main(void)
{
	int score;
	cin >> score;
	
	if (score>=90)
		cout << 'A' << endl;
	else if (score>= 80)
		cout << 'B' << endl;
	else if (score>= 70)
		cout << 'C' << endl;
	else if (score>= 60)
		cout << 'D' << endl;
	else
		cout << 'F' << endl;

		
		
				
}
 

i = 0
s = 0
a = input();
for i in range(1,a+1):
     s = s + i
print s