#include <bits/stdc++.h>
#define taskname "test"
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using pii = pair <ll, ll>;
using pil = pair <ll, ll>;
using pli = pair <ll, ll>;
using pll = pair <ll, ll>;
using ull = unsigned ll;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());
ll min(const ll &a, const ll &b){
return (a < b) ? a : b;
}
ll max(const ll &a, const ll &b){
return (a > b) ? a : b;
}
//const ll Mod = 1000000009;
//const ll Mod2 = 999999999989;
//only use when required
const ll maxN = 3e5 + 1;
const ll maxR = 3e4;
ll n, r, q, sq;
vector <ll> color[maxR];
vector <ll> adj[maxN];
vector <vector<ll>> cnt, rcnt;
ll pos[maxN], be[maxN], child[maxN];
ll dpos[maxN], time_in;
ll bit[maxN];
void update(ll x, ll val){
for (; x <= n; x += x & -x){
bit[x] += val;
}
}
ll get(ll x){
ll sum = 0;
for (; x; x -= x & -x){
sum += bit[x];
}
return sum;
}
void pre_dfs(ll u){
dpos[u] = ++time_in;
for (const ll &i: adj[u]){
pre_dfs(i);
child[u] += child[i] + 1;
}
}
ll dfs(ll u, ll c, ll up = 0){
ll summ = 0;
if (be[u] == c) ++up;
else rcnt[rcnt.size() - 1][be[u]] += up;
for (const ll &i: adj[u]){
summ += dfs(i, c, up);
}
if (be[u] == c) return summ + 1;
cnt[cnt.size() - 1][be[u]] += summ;
return summ;
}
void Init(){
cin >> n >> r >> q;
sq = sqrt(n) + 1;
ll t; cin >> t;
be[1] = t;
color[t].pb(1);
for (ll i = 2; i <= n; ++i){
ll p, t;
cin >> p >> t;
color[t].pb(i);
be[i] = t;
adj[p].pb(i);
}
pre_dfs(1);
for (ll i = 1; i <= r; ++i){
if (color[i].size() >= sq){
pos[i] = cnt.size();
cnt.pb({});
rcnt.pb({});
cnt.back().resize(maxR, 0);
rcnt.back().resize(maxR, 0);
dfs(1, i);
}
}
for (ll i = 1; i <= q; ++i){
ll u, v;
cin >> u >> v;
if (color[v].size() >= sq){
cout << cnt[pos[v]][u] << endl;
}
else if (color[u].size() >= sq){
cout << rcnt[pos[u]][v] << endl;
}
else{
for (const ll &i: color[v]){
update(dpos[i], 1);
}
ll ans = 0;
for (const ll &i: color[u]){
ans += get(dpos[i] + child[i]) - get(dpos[i]);
}
cout << ans << endl;
for (const ll &i: color[v]){
update(dpos[i], -1);
}
}
}
}
int main(){
if (fopen(taskname".inp", "r")){
freopen(taskname".inp", "r", stdin);
//freopen(taskname".out", "w", stdout);
}
faster;
ll tt = 1;
//cin >> tt;
while (tt--){
Init();
}
}
