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