#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)
using ll = long long;
#define all(p) p.begin(),p.end()

int main(){
	vector<ll> p(5);
	rep(i,0,5) cin>>p[i];
	vector<ll> base(5);
	ll ans=1e18;
	int L=0,R=6;
	ll K=6;
	auto f=[&](auto self,int ind)->void{
		if(ind<5){
			for(int i=L;i<R+1;i++){
				base[ind]=i;
				self(self,ind+1);
			}
		}
		if(ind==5){
			bool ok=1;
			rep(i,0,5){
				int tmp=0;
				rep(j,0,3){
					tmp+=base[(i+j)%5];
				}
				if(tmp<K) ok=0;
			}
			if(ok){
				ll v=0;
				rep(i,0,5){
					v+=base[i]*p[i];
				}
				ans=min(ans,v);
			}
		}
	};
	f(f,0);
	assert(ans%K==0);
	std::cout<<ans/K<<"\n";
}