#include<bits/stdc++.h>
//ios::sync_with_stdio(false);
//cin.tie(0);
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<pii,int> ppii;
typedef pair<int,pii> pipi;
typedef pair<ll,ll> pll;
typedef pair<pll,ll> plpl;
typedef tuple<ll,ll,ll> tl;
ll mod2=1000000007;
ll mod=998244353;
ll inf=1000000000000000000;
double pi=2*acos(0);
#define rep(i,m,n) for(int i=m;i<n;i++)
#define rrep(i,n,m) for(int i=n;i>=m;i--)
int dh[4]={1,-1,0,0};
int dw[4]={0,0,1,-1};
int ddh[8]={-1,-1,-1,0,0,1,1,1};
int ddw[8]={-1,0,1,-1,1,-1,0,1};
ll lmax(ll a,ll b){
    if(a<b)return b;
    else return a;
}
ll lmin(ll a,ll b){
    if(a<b)return a;
    else return b;
}
int main(){
    int n;cin>>n;
    string s;
    getline(cin,s);
    rep(i,0,s.size()){
        if(s[i]==' '){
            cout<<"assert"<<endl;
            return 0;
        }
    }
    ll a=0;
    ll now=1;
    rrep(i,s.size()-1,0){
        ll y=s[i]-'0';
        a+=now*y;
        now*=10;
    }
    ll b,c;cin>>b>>c;
    vector<ll> v;
    v.push_back(a+b);
    v.push_back(a+c);
    v.push_back(b+c);
    sort(v.begin(),v.end());
    v.erase(unique(v.begin(),v.end()),v.end());
    reverse(v.begin(),v.end());
    cout<<v[1]<<endl;
}