#include<bits/stdc++.h>
using namespace std;
int main(){
	double a[10]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};
	double sum=0;
	for(auto p:a){
		int x;
		cin>>x;
		sum+=x*p;
	}
	printf("%.1lf",sum);
	return 0;
}