#include<bits/stdc++.h>
using namespace std;
using ll = long long;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("YES")
#define p_no() p("NO")

const ll mod = 1e9 + 7;
const ll inf = 1e18;

void vprint(vector<ll> A){
    ll L = A.size();
    FOR(i, 0, L){
        if(i) cout << ' ';
        cout << A[i];
    }
    cout << endl;
}

vector<string> split_str(string s, char c){
    vector<string> ret;
    stringstream ss;
    FOR(i, 0, s.size()){
        if(s[i]==c){
            ret.push_back(ss.str());
            ss.str("");
            ss.clear();
        }else{
            ss << s[i];
        }
    }
    ret.push_back(ss.str());
    return ret;
}

int main(){
    // cin.tie(0);
    // ios::sync_with_stdio(false);

    // input
    ll N;
    cin >> N;

    string dustbox;
    getline(cin, dustbox);

    string s;
    getline(cin, s);

    bool has_space = false;
    for(char c : s){
        if(c==' ') has_space = true;
    }

    if(has_space){
        p("\"assert\"");
        return 0;
    }

    vector<ll> A;
    A.push_back(stoll(s));
    ll a1; cin >> a1; A.push_back(a1);
    ll a2; cin >> a2; A.push_back(a2);

    set<ll> se;
    se.insert(A[0]+A[1]);
    se.insert(A[1]+A[2]);
    se.insert(A[2]+A[0]);
    
    vector<ll> B;
    for(ll a : se){
        B.push_back(a);
    }
    sort(ALL(B));

    ll L = B.size();
    ll ans = B[L-2];
    p(ans);

    return 0;
}