# include<iostream> using namespace std; int main(){ /* long long n,i,sum=1; cin>>n; for(i=2;i<=n;i++){ sum=sum*i; } cout<<sum; */ int s,sum=0,a; for(int i=1;i<=7;i++){ cin>>a; sum+=a; } s=sum/7; cout<<s; return 0; }