#include <iostream> #include <vector> using namespace std; int main() { int n; cin >> n; vector<int> colors(7); for (int i = 0; i < n; i++) { cin >> colors[i]; } int score = 0; int redCount = 0; for (int i = 0; i < n; i++) { if (colors[i] == 1) { redCount++; } else if (colors[i] == 7) { score += colors[i]; } else { if (redCount % 2 == 0) { score += colors[i]; } } } cout << score << endl; return 0; }