#include<iostream>
#include<cstdio>
using namespace std;
int main()
{

	double sum = 0;
	double a[10] = { 28.9,32.7,45.6,78,35,86.2,27.8,43,56,65 };
	double b[10] = { 0 };
	for (int i = 0; i < 10; i++)
	{
		cin >> b[i];
	}
	for (int i = 0; i < 10; i++)
	{
		sum += b[i] * a[i];
	}
	printf("%.1llf", sum);
	return 0;
}