text: #include <iostream>
  
  using namespace std;
  
  int main(){
      float money = 0.0;
      float temp = 0.0;
      for (int i = 0; i < 12; ++i) {
          cin >> temp;
          money += temp;
      }
      cout << "$" << money / 12.0;
      return 0;
  }
  
  