#include<bits/stdc++.h>
using namespace std;
double a[10]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};
int main()
{
    double x,ans=0;
    for(int i=1;i<=10;i++){
        cin>>x;
        ans+=a[i-1]*x;
    }
    cout<<ans;
}