#include<bits/stdc++.h> using namespace std; int b[10]; int sum=0; int main(){ int f[10]={0,1,2,3,4,5,6,7}; for(int i=1;i<=7;i++){ cin>>b[i]; sum+=b[i]*f[i]; } sum=b[7]*a[1]; cout<<sum; return 0; }