#include <algorithm>
#include <fstream>
#include <vector>

using namespace std;

const int Dim = 200001;

int N;
int gc[Dim];
vector <int> v[Dim];

int main() {

    ifstream fin( "guvern.in" );
    ofstream fout( "guvern.out" );

    int i, x, y;

    fin >> N;
    for( i = 1; i <= N - 1; ++i ) {

        fin >> x, fin >> y;
        v[x].push_back( y );
        v[y].push_back( x );
    }
    for( i = 1; i <= N; ++i )
        fin >> gc[i];

    fout << N;

    fin.close();
    fout.close();

    return 0;
}