#include<iostream>
#include<algorithm>
#include<string>
#include<vector>
using namespace std;
using lint=int64_t;

int main()
{
	lint N;
	lint A[3]{};
	string input;

	cin >> N;
	getline(cin,input);
	for(int i=0;i<3;i++)
	{
		getline(cin,input);
		
		for(auto&& j:input)
		{
			if(j==' ')
			{
				cout << "\"assert\"" << endl;
				return 0;
			}
			A[i]*=10;
			A[i]+=(j-'0');
		}
	}

	vector<lint> v;
	v.push_back(A[0]+A[1]);
	v.push_back(A[1]+A[2]);
	v.push_back(A[2]+A[0]);
	sort(v.begin(),v.end(),greater<lint>());
	v.erase(unique(v.begin(),v.end()),v.end());
	cout << v[1] << endl;
	return 0;
}