#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<algorithm>
#include<vector>
#include<string.h>
#include<math.h>
#include<map>
#include<iomanip>
#include<queue>

using namespace std;

long long s_to_ll(string s){
	long long res=0;
	for(int i=0;i<s.size();i++){
		res+=(long long)(s[i]-'0');
		res*=10;
	}
	res/=10;
	//cout << res << endl;
	return res;
}

int main(){
	int n;
	cin >> n;
	vector<long long> a;
	string skip,t;
	getline(cin,skip);
	for(int i=0;i<=n;i++){
		if(i==0)continue;
		getline(cin,t);
		for(int j=0;j<t.size();j++){
			if(t[j]>'9' || '0'>t[j]){
				cout << '"' << "assert" << '"' << endl;
				return 0;
			}
		}
		a.push_back(s_to_ll(t));
	}
	
	vector<long long> b(n);
	b[0]=a[0]+a[1];
	b[1]=a[0]+a[2];
	b[2]=a[1]+a[2];
	sort(b.begin(),b.end());
	
	if(b[2]>b[1])cout << b[1] << endl;
	else cout << b[0] << endl;
	
	return 0;
}