#include <bits/stdc++.h>
#define int ll
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define all(a) a.begin(), a.end()
#define sz(a) ((int) a.size())
#define vec(...) vector<__VA_ARGS__>
#define _4ab8goq ios::sync_with_stdio(0),cin.tie(0);
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pii;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}

void slv(){
	const int n=4;
	vi ord(n);
	iota(all(ord),0);
	vec(vi) adj={
		{0,3},
		{1,3},
		{0,1,2,3},
		{3}
	};
	vi cnt(n);
	rep(i,n){
		cin>>cnt[i];
	}
	int ans=0;
	do{
		int now=0;
		rep(i,n){
			now+=cnt[ord[i]];
			ans=max(ans,now);
			if(i+1<n){
				int ho=0;
				for(auto v:adj[ord[i+1]]){
					if(v==ord[i]){
						ho=1;
					}
				}
				if(!ho) break;
			}
		}
	}while(next_permutation(all(ord)));
	print(ans);
}

signed main(){
_4ab8goq;
	slv();
}