#include <stdio.h> #include #include <math.h> using namespace std; int main() { int n; cin >> n; int sum = 0; for(int i = 0 ;i < n ; i++) { int x; cin >> x; sum += x/70; if(x%70 != 0) { sum++ } } cout << sum/10 << "." << sum%10 << endl; }