#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
using namespace std;
typedef long long ll;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	string n;
	getline(cin, n);
	string s;
	getline(cin, s);
	ll a = 0;
	rep(i, s.size()) {
		if (s[i] == ' ') {
			cout << '"' << "assert" << '"' << endl;
			return 0;
		}
		a *= 10;
		a += s[i] - '0';
	}
	ll b, c;
	cin >> b >> c;
	vector<ll> d = {a+b,a+c,b+c};
	sort(d.begin(), d.end());
	if (d[1] == d[2]) cout << d[0];
	else cout << d[1];
}