#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
	int N;
	cin >> N;
	char c;
	cin >> c;
	string S;
	getline(cin, S);
	int M = S.size();
	bool ok = true;
	for (int i = 0; i < M; i++){
		if (S[i] == ' '){
			ok = false;
		}
	}
	if (!ok){
		cout << "assert" << endl;
	} else {
		long long A1 = stoll(S);
		long long A2;
		cin >> A2;
		long long A3;
		cin >> A3;
		vector<long long> A = {A1 + A2, A2 + A3, A3 + A1};
		sort(A.begin(), A.end());
		A.erase(unique(A.begin(), A.end()), A.end());
		cout << A[A.size() - 2] << endl;
	}
}