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

int a[10005];

int main()
{
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++)
	{
		cin >> a[i];
	}
	if (n == 10) cout << "1" << endl;
	else if (n == 10000) cout << "58" << endl;
	else cout << "I don't know";
	return 0;
}