#include<bits/stdc++.h>
using namespace std;
double a[11]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};
int main(){
  double b[11],sum=0;
  for(int i=0;i<10;i++){
    cin>>b[i];
  }
  for(int i=0;i<10;i++){
    sum+=a[i]*b[i];
  }
  cout<<fixed<<setprecision(1)<<sum;
  return 0;
}