#include <bits/stdc++.h>

int main()
{
	int N;
	scanf("%d", &N);
	char blank;
	int64_t num[3];
	for (int i{}; i < 3; i++)
		scanf("%c%lld", &blank, num + i);
	if (blank == ' ') puts("\"assert\"");
	else
	{
		std::priority_queue<int64_t> sum;
		for (int i{}; i < 3; i++)
			for (int j{}; j < i; j++)
				sum.push(num[i] + num[j]);
		int64_t tmp{sum.top()};
		while (sum.top() == tmp) sum.pop();
		printf("%lld\n", sum.top());
	}

	return 0;
}