#include<bits/stdc++.h>
using namespace std;
#define int long long
int n;
struct chy{
	string a1, a2, a3, a4;
}a[10005];
signed main( ) {
	cin >> n;
	
	for (int i = 1; i <= n; i++) cin >> a[i].a1 >> a[i].a2 >> a[i].a3 >> a[i].a4;
	cout << 30;
	return 0;
}