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- #include <iostream>
- using namespace std ;
- int main() {
- int n;
- cin >> n;
- int faktoriel = 1;
- double P = 0.0;
- int tmp_n = n;
- for(int i = 1; i <= n; i++) {
- faktoriel *= i;
- P += ((double) faktoriel / (double) tmp_n);
- tmp_n--;
- }
- cout << P << endl;
- return 0;
- }
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