#include<bits/stdc++.h>
using namespace std;
float a[10]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};
int main(){
    int b;
    float c=0,d=0;
    for(int i=0;i<=9;i++){
    	cin>>b;
		c=a[i]*b;
		d=d+c;
	}
    printf("%.1lf",d);
    return 0;
}