#include<bits/stdc++.h>
using namespace std;
float sum = 0.0;
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;
		sum = sum + a[i] * num;
	} 
    cout << sum ;
	return 0;
}