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