#include<iostream>
using namespace std;

// This function adds up all the number less than or equal to n
// So, not_function_a(5) = 1 + 2 + 3 + 4 + 5
int not_function_a(int n){
	int sum = 0;
	for(int i = 1; i <= n; i++)
		sum += i;
	return sum;
}

long A(long n){
	long pro = 1;
	for(int x = 1; x <= 10; x++){
		pro *= x * n;
	}
	return pro;
}

int main(){
	cout << not_function_a(5) << endl;
	cout << std::fixed << A(1) << endl;
	cout << std::fixed << A(5) << endl;
}