#include <bits/stdc++.h>
using namespace std;
inline int read()
{
int sum = 0,n = 1;
char ch = getchar();
while(ch > '9' || ch < '0')
{
if(ch == '-')
{
n =- 1;
ch = getchar();
}
}
while(ch <= '9' && ch >= '0')
{
sum = sum * 10 + ch - '0',ch = getchar();
}
return sum * n;
}
int main()
{
int x;
double a[10] = {28.9,32.7,45.6,78,35,86.2,27.8,43,56,65},num = 0;
for (int i = 1;i <= 10;i++)
{
cin >> x;
num += x * a[i];
}
cout << fixed << setprecision(1) << num;
return 0;
}
