#include<bits/stdc++.h> using namespace std; int main(){ int sum=0,i,a[8]={}; for(i=1;i<=7;i++){ cin>>a[i] ; } if(a[1]!=0){ i=7; while(a[i]==0)i--; if(i==1){ cout<<1<<endl; return 0; } else sum+=a[i]*(1+i); } for(int j=2;j<=7;j++)sum+=a[j]*j; cout<<sum<<endl; return 0; }