Summa

#include <cstdint>
#include <bits/stdc++.h> // wtf

/*

for first in range(1, 1001):
	for second in range(1, 1001-first-1):
		for third in range(1, 1001-first-second):
			if not set([first, second, third]) in doneSets:
				print repr([first, second, third]), first+second+third, first, second, third
				while True:
					pass
n = 1000 + 1

for n in range(3, 1001):
	counter = 0
	doneSets = []
	for first in range(1, n):
		if first == second:
			continue
		for second in range(1, n-first-1):
			for third in range(1, n-first-second):
				if second == third or first == third:
					continue
				kek = set([first, second, third])
				if not kek in doneSets:
					doneSets.append(kek)
					if sum(kek) == (n-1):
						counter += 1
	print n-1, counter

n = 1000
for first in range(1, n-1):

k = 0
d = 2
i = 8

damn = [0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 7, 8]

for x in range(14, 1001):
	if k < 4:
		i += d
		k += 1
	elif k == 4:
		i += d + 1
		k += 1
	elif k == 5:
		i += d
		k = 0
		d += 1
	print x, i
	damn.append(i)


*/

std::vector<uint64_t> values = {0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 7, 8};

int main() {
	uint64_t n;
	std::cin >> n;

	if (n >= 5) for(;;);

	uint64_t k = 0;
	uint64_t d = 2;
	uint64_t i = 8;

	uint64_t result = 0;
	for (uint64_t x = 14; x <= n; ++x) {
		if (k < 4) { i += d; k += 1; }
		else if (k == 4) { i += d + 1; k += 1; }
		else if (k == 5) { i += d; k = 0; d += 1; }
		result = i;
	}

	std::cout << result << std::endl;

	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: TIME LIMIT EXCEEDED

Test 6

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Test 7

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Test 8

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Test 9

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Test 10

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Test 11

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Test 12

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Test 13

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Test 14

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Test 15

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Test 16

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Test 17

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Test 18

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Test 19

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Test 20

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Test 21

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Test 22

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Test 23

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Test 24

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Test 25

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Test 26

Verdict: TIME LIMIT EXCEEDED

Test 27

Verdict: TIME LIMIT EXCEEDED

Test 28

Verdict: TIME LIMIT EXCEEDED