#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}; int b[10]; double sum=0; for(int i=0;i<10;i++) { cin>>b[i]; sum+=a[i]*b[i]; } cout<<sum; return 0; }