#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	int N;
	cin >> N;
	getchar();
	string S;
	getline(cin, S);
	if (count(ALL(S), ' ')) puts("\"assert\"");
	else {
		int A[3];
		A[0] = stoi(S);
		REP(i, 2) cin >> A[i + 1];
		set<int> ss;
		REP(i, 3) FOR(j, i + 1, 3) ss.emplace(A[i] + A[j]);
		printf("%d\n", *----ss.end());
	}
}