#include <iostream>
#include <vector>
using namespace std;
int main() {
int n;
int licznik = 0;
int suma = 0;
cin >> n;
vector<int> ted(n);
for(int i = 0; i < n; i++) {
cin >> ted[i];
}
for(int i = 0; i < ted.size(); i++) {
suma = suma + ted[i];
}
if(suma >= 2) {
licznik++;
}
cout << licznik;
return 0;
}
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