#include <bits/stdc++.h> using namespace std;

double a[10] = {28.9, 32.7, 45.6, 78, 35, 86.2, 27.8, 43, 56, 65};

int main() { int x; double sum = 0; for (int i = 0; i < 10; i++) { cin >> x; sum = sum + x * a[i]; } cout << fixed << setprecision(1) << sum; //printf("%lf",sum); return 0; }