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#include <iostream> using namespace std; int broj_na_deliteli(int n, int idx) { if(idx > n) { return 0; } bool deliv = ((n % idx) == 0); return broj_na_deliteli(n, idx + 1) + deliv; } int k_deliv(int x, int idx, int k) { if(idx < x - k or idx == 0) { return 1; } if(broj_na_deliteli(idx, 1) >= broj_na_deliteli(x, 1)) { return 0; } return k_deliv(x, idx - 1, k); } int sum(int a, int b, int k) { if(a > b) { return 0; } int dodadi = 0; if(k_deliv(a, a - 1, k)) { dodadi = a; } return sum(a + 1, b, k) + dodadi; } int main() { int a, b, k; cin >> a >> b >> k; cout << sum(a, b, k) << endl; return 0; }
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