#include <bits/stdc++.h>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <iostream>
#define MAXN 500001
using namespace std;
vector <int> galezie[MAXN];
bitset <MAXN> odw;
bitset <MAXN> strajk;
/*
void ilosc_poddrzew(int a)
{
int wynik = 0;
bool x = 0;
for(int i = 1; i <= a; i++)
{
if(strajk[i] && galezie[i].size() > 1)
{
for(int j = 0; j < galezie[i].size(); j++)
{
//printf("%d ",galezie[i][j]);
if(strajk[galezie[i][j]] == 0) wynik++;
/*if(x == 0)
{
wynik--;
x++;
}//
}
}
if(galezie[i].size() == 1 && wynik == 0 && strajk[i]) wynik++;
}
printf("%d\n",wynik);
}
*/
int main()
{
int n, x, y, m, pomoc_strajki;
int wynik = 1;
scanf("%d",&n);
for(int i = 1; i < n; i++)
{
scanf("%d%d",&x,&y);
galezie[x].push_back(y);
galezie[y].push_back(x);
}
scanf("%d",&m);
for(int i = 0; i < m; i++)
{
scanf("%d",&pomoc_strajki);
if(pomoc_strajki > 0) strajk[pomoc_strajki].flip();
else strajk[pomoc_strajki * -1].flip();
if(pomoc_strajki > 0)
{
wynik--;
for(int j = 0; j < galezie[i].size(); i++)
if(!strajk[j]) wynik++;
}
else
{
wynik++;
for(int j = 0; j < galezie[i].size(); i++)
if(!strajk[j]) wynik--;
}
//ilosc_poddrzew(n);
printf("%d",wynik);
}
}
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}