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- #include <iostream>
- #include<stack>
- using namespace std;
- int main()
- {
- int n;
- cin >> n;
- int niza[n];
- for(int i = 0; i < n; i++) {
- cin >> niza[i];
- }
- int broj_na_edinici = 0;
- int rez = 0;
- for(int i = 0; i < n; i++) {
- if(niza[i] == 1) {
- broj_na_edinici++;
- }
- else {
- rez += broj_na_edinici;
- }
- }
- cout << rez << endl;
- return 0;
- }
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