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- #include <iostream>
- using namespace std;
- int main() {
- int k;
- cin >> k;
- int broj = 1;
- int zbir = 0;
- for(int i = 1; i <= k; i += 1) {
- zbir += broj;
- broj += 3;
- }
- cout << zbir << endl;
- return 0;
- }
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