Summa

//============================================================================
// Name        : Tehtava1.cpp
// Author      : Dan
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <bits/stdc++.h>
using namespace std;
int n;
vector<int> v;

int c = 0;

int main() {
	cin >> n;
	v.resize(n);
	for(int i = 0; i < n; i++)	{
		v[i] = i + 1;
	}
	sort(v.begin(), v.end());
	for(int j = 0; j < n; j++)	{
		for(int k = j; k < n; k++)	{
			if(v[k] != v[j])	{
				int m = n - v[k] -v[j];
				if(m > 0 && m > v[k] && m > v[j])	{
					c++;
				}
			}
		}
	}
	cout << c;
	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED