#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}


template<typename T>
vector<T> compress(vector<T> v){
  sort(v.begin(),v.end());
  v.erase(unique(v.begin(),v.end()),v.end());
  return v;
}

template<typename T>
map<T, Int> dict(const vector<T> &v){
  map<T, Int> res;
  for(Int i=0;i<(Int)v.size();i++)
    res[v[i]]=i;
  return res;
}

//INSERT ABOVE HERE
signed main(){
  string s,t;
  getline(cin,s);
  getline(cin,t);
  if(t.find(" ")!=string::npos){
    cout<<"\"assert\""<<endl;
  }else{
    string u,v;
    getline(cin,u);
    getline(cin,v);
    Int x=stoll(t);
    Int y=stoll(u);
    Int z=stoll(v);

    vector<Int> vs;
    vs.emplace_back(x+y);
    vs.emplace_back(y+z);
    vs.emplace_back(z+x);
    vs=compress(vs);
    reverse(vs.begin(),vs.end());
    cout<<vs[1]<<endl;
  }
  return 0;
}