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- #include <iostream>
- using namespace std;
- int main() {
- int n;
- cin >> n;
- int a[n];
- for(int i = 0; i < n; i++) {
- cin >> a[i];
- }
- int res = 0;
- for(int i = 0; i < n; i++) {
- int najmal_broj = a[i];
- int prv = a[i];
- int j = i + 1;
- while(j < n and prv + 1 == a[j]) {
- j++;
- prv++;
- }
- res += najmal_broj;
- i = j - 1;
- }
- cout << res << endl;
- return 0;
- }
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