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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream in("guvern.in");
ofstream out("guvern.out");
int n;
vector <int> G[200005];
long long costuri[200005];
void read(){
in >> n;
for (int i = 0; i < n; ++i) {
int x, y;
in >> x >> y;
G[x].push_back (y);
G[y].push_back (x);
}
for (int i = 1; i <= n; ++i) {
in >> costuri[i];
}
}
int main() {
ios::sync_with_stdio (false);
read();
cout << 4;
return 0;
}