#include<bits/stdc++.h>
using namespace std;
int main()
{
    float a[10]={28.9, 32.7, 45.6, 78, 35, 86.2, 27.8, 43, 56, 65};
    float sum = 0, num;
    for(int i = 0; i <
 
 10; ++i)
    {
        cin>>num;//輸入書籍本數
        sum += a[i] * num;
    }
    cout<<sum;
    return 0;
}

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