#include<bits/stdc++.h>
using namespace std;
int main()
{
    double a[5],b[5]={28.9,32.75,45.6,78.0,35.7},s=0;
    for(int i=0;i<5;i++)cin>>a[i];
    for(int i=0;i<5;i++)s+=a[i]*b[i];
    cout<<s;
}