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- #include <iostream>
- using namespace std;
- int main()
- {
- int n;
- cin >> n;
- int broj_na_tocki = 0;
- for(int i = 0; i <= n; i++) {
- for(int j = i; j <= n; j++) {
- broj_na_tocki += (i + j);
- }
- }
- cout << broj_na_tocki << endl;
- return 0;
- }
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