#include <bits/stdc++.h>
using namespace std;
int main(){
    double prices[10]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};//因为我们要初始化每本书的价钱 
    int sums[10];
    for(int i=0; i<10;i++)
        cin>>sums[i];
    double sum=0;
    for(int i=0;i<10;i++)
        sum+=prices[i]*sums[i];//买的数量乘以价钱 
    cout<<fixed<<setprecision(1)<<sum<<endl;  
    return 0;
}