#include <bits/stdc++.h>

using namespace std;

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

int n;

vector <int> g[200005];

int a[200005];

int depth[200005];

int p[20][200005];

set <pair <int,int>> s;

int b[200005];
int bb[200005];

int c[200005];

queue <int> q;

void dfs(int u,int pp)
{
    auto it=s.lower_bound(make_pair(a[u],u));
    if(it!=s.end())
    {
        b[u]=it->second;
        bb[u]=u;
        for(int i=0; (1<<i)<=depth[u]-depth[b[u]]-1; i++)
            if((depth[u]-depth[b[u]]-1)&(1<<i))
                bb[u]=p[i][bb[u]];
    }
    else
        b[u]=bb[u]=n+1;

    s.insert(make_pair(a[u],u));

    for(int v:g[u])
    {
        if(v!=pp)
        {
            c[u]++;

            depth[v]=depth[u]+1;

            p[0][v]=u;
            for(int j=1; (1<<j)<=depth[v]; j++)
                p[j][v]=p[j-1][p[j-1][v]];

            dfs(v,u);
        }
    }

    s.erase(make_pair(a[u],u));
}

int aux[200005];
int dp[200005];

int main()
{
    fin>>n;
    for(int i=1; i<n; i++)
    {
        int x,y;
        fin>>x>>y;
        g[x].push_back(y);
        g[y].push_back(x);
    }
    for(int i=1; i<=n; i++)
        fin>>a[i];

    dfs(1,0);

    for(int i=1; i<=n; i++)
        if(c[i]==0)
            q.push(i);

    int ans=0;
    while(!q.empty())
    {
        int x=q.front();
        q.pop();

        dp[x]=1;
        for(int y:g[x])
            if(y!=p[0][x])
                dp[x]+=aux[y];

        ans=max(ans,dp[x]);

        if(bb[x]<=n)
            aux[bb[x]]=max(aux[bb[x]],dp[x]);

        c[p[0][x]]--;
        if(c[p[0][x]]==0)
            q.push(p[0][x]);
    }

    fout<<ans<<"\n";
    return 0;
}