Summa

input/code.cpp: In function 'int main()':
input/code.cpp:7:8: warning: unused variable 'cc' [-Wunused-variable]
   long cc = 0;
        ^~

#include<bits/stdc++.h>
using namespace std;

int main() {
  set<set<int> > v;
  int n; cin >> n;
  long cc = 0; 
  for(int i = 1; i <= 1000; i++) {
    for(int j = i; j <= 1000; j++) {
      for(int k = j; k <= 1000; k++) {
	if(i == j || i == k || j == k) continue;
	if(i+j+k == n) {
	  //cout << i << " : " << j << " : " << k << "\n";
	  set<int> a; a.insert(i); a.insert(j); a.insert(k);
	  v.insert(a);
	}
      }
    }
  }
  cout << v.size();
}

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