/*
Lemme check my list of powers and weaknesses:
ability to do anything, but only whenever I want.
*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 2e5 + 10, R = 3e4, Q = 2e5 + 10, SQ = 469;
int n, r, q, Time, H[N], P[N], St[N], Ft[N], ID[R], cnt[N], Ans[SQ][R];
vector<int> Adj[N], Reg[R], Home[R];
void PreDFS(int v){
St[v] = ++Time;
Reg[H[v]].push_back(Time);
for(int u : Adj[v])
PreDFS(u);
Ft[v] = Time;
}
void DFS(int v){
if((int) Home[H[v]].size() >= SQ) cnt[ID[H[v]]]++;
for(int u : Adj[v]){
for(int i = 1; i < SQ; i++)
Ans[i][H[u]] = cnt[i];
DFS(u);
}
if((int) Home[H[v]].size() >= SQ) cnt[ID[H[v]]]--;
}
int solve(int r2, int r1){
if((int) Home[r1].size() >= SQ) return !(cout << Ans[ID[r1]][r2] << endl);
else{
int Res = 0;
for(int x : Home[r1]){
auto X1 = lower_bound(Reg[r2].begin(), Reg[r2].end(), St[x]);
auto X2 = upper_bound(Reg[r2].begin(), Reg[r2].end(), Ft[x]);
Res += X2 - X1;
}
return !(cout << Res << endl);
}
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0), cout.tie(0);
cin >> n >> r >> q;
for(int i = 1; i <= n; i++){
if(i == 1){
cin >> H[i];
Home[H[i]].push_back(i);
}
else {
cin >> P[i] >> H[i];
Adj[P[i]].push_back(i);
Home[H[i]].push_back(i);
}
}
PreDFS(1);
int ind = 0;
for(int i = 1; i <= r; i++)
if((int) Home[i].size() >= SQ)
ID[i] = ++ind;
DFS(1);
while(q--){
int r1, r2;
cin >> r1 >> r2;
solve(r1, r2);
}
return 0;
}
