#include <algorithm>
#include <cstdint>
#include <iostream>

using namespace std;

int64_t S1(int64_t n) {
	if (n > 0) return (1 + n) / 2 * n;
	else return (1 + n) / 2 * (2 - n);
}

int64_t S2(int n) {
	int64_t sum = 0;
	for (int i = min(1, n); i <= max(1, n); ++i) {
		sum += i;
	}
	return sum;
}

int main() {
	cout << S1(-5) << ' ' << S2(-5) << ' ' << -5 << '\n';

	for (int i = 0; i <= 10'000; --i) {
		if (S1(i) != S2(i)) {
			cout << S1(i) << ' ' << S2(i) << ' ' << i << '\n';
		}
	}

	/*
	int64_t n;
	cin >> n;
	cout << S2(n);
	return 0;
	*/
}