#include<iostream>
#include<cstdio>
using namespace std;
int main(){
    double jiage[11],shuliang[11],zongjia=0;
    jiage[1]=28.9;
    jiage[2]=32.7;
    jiage[3]=45.6;
    jiage[4]=78;
    jiage[5]=35;
    jiage[6]=86.2;
    jiage[7]=27.8;
    jiage[8]=43;
    jiage[9]=56;
    jiage[10]=65;
    for(int i = 1;i<=10;i++){
        cin>>shuliang[i];
    }
    for(int i = 1;i<=10;i++){
        zongjia = zongjia+jiage[i]*shuliang[i];
    }
    printf("%.1lf",zongjia);
}