#include <bits/stdc++.h>
#define _GLIBCXX_DEBUG
#define UNIQUE(v) v.erase(unique(v.begin(), v.end()), v.end());
using namespace std;
typedef long long ll;

int main(){
	string n; getline(cin, n);
	string s; getline(cin, s);
	if(s.find(" ")!=string::npos){cout << "\"assert\"" << endl; return 0;}
	ll a,b,c;
	a=stoll(s);
	cin>>b; cin>>c;
	vector<ll> v(3);
	v[0]=a+b;
	v[1]=a+c;
	v[2]=b+c;
	sort(v.begin(),v.end());
	UNIQUE(v);
	if(v.size()==2) cout << v[0] << endl;
	else cout << v[1] << endl;	
}