#include<bits/stdc++.h>
using namespace std;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long LL;
typedef pair<LL,LL> P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<typename T> T gcd(T a,T b){return b?gcd(b,a%b):a;}
const LL mod=1000000007;
const LL LINF=1LL<<62;
const int INF=1<<30;
int dx[]={1,0,-1,0,1,-1,1,-1};
int dy[]={0,1,0,-1,1,-1,-1,1};
 

int main(){
    int n;cin >> n;
    string s;
    getline(cin, s);
    vector<LL> a;
    for (int i = 0; i < n; i++) {
        string s = "";
        getline(cin, s);
        if(s == ""){
            puts("\"assert\"");
            return 0;
        }
        else{
            a.pb(stol(s));
        }
    }
    vector<LL> x;
    x.pb(a[0] + a[1]);
    x.pb(a[0] + a[2]);
    x.pb(a[2] + a[1]);
    sort(ALL(x));
    x.erase(unique(ALL(x)),x.end());
    sort(RALL(x));
    cout << x[1] << endl;
    return 0;
}