#include <bits/stdc++.h>
using namespace std;
int main()
{
	double book[10] = {28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};
	double sum[10],ans = 0;
	for (int i = 0; i < 10; i++) 
	{
		cin >> sum[i];
		ans += book[i] * sum[i];
	}
	cout << ans << endl;
	return 0;
}