#include "bits/stdc++.h"
using namespace std;

int main() {
	long long X[3] = {};
	string N, S;
	getline(cin, N);
	getline(cin, S);
	for (int i = 0; i < S.size(); i++) {
		if (S[i] == ' ') {
			cout << '"' << "assert" << '"' << endl;
			return 0;
		}
		X[0] *= 10;
		X[0] += S[i] - '0';
	}
	cin >> X[1] >> X[2];
	vector<long long> V(3);
	V[0] = X[0] + X[1], V[1] = X[1] + X[2], V[2] = X[2] + X[0];
	sort(V.begin(), V.end());
	V.erase(unique(V.begin(), V.end()), V.end());
	reverse(V.begin(), V.end());
	cout << V[1] << endl;
}