#include <bits/stdc++.h>
using namespace std;
#define siz(x) (int)x.size()
#define pb push_back
#define all(x) x.begin(), x.end()
const int MAX = 2e5+5;
const int BLOCK = 500;
vector<int> adj[MAX], comp[MAX], occ[MAX];
int cmp[MAX], in[MAX], sub[MAX], res[400][25005], pp[MAX], curr;
int dfs(int v){
in[v] = ++curr;
occ[cmp[v]].pb(in[v]);
for (int u: adj[v]) sub[v] += dfs(u);
return (sub[v] += 1);
}
void dfs2(int v, int tar, int curr){
if (cmp[v] == tar) curr++;
res[pp[tar]][cmp[v]] += curr;
for (int u: adj[v]) dfs2(u, tar, curr);
}
int main(){
cin.tie(0)->sync_with_stdio(0);
int n, r, q; cin >> n >> r >> q;
for (int i = 1; i <= n; i++){
if (i > 1){
int a; cin >> a;
adj[a].pb(i);
}
cin >> cmp[i];
comp[cmp[i]].pb(i);
}
dfs(1);
curr = 0;
for (int i = 1; i <= r; i++){
if (siz(comp[i]) < BLOCK) continue;
pp[i] = ++curr;
dfs2(1, i, 0);
}
while (q--){
int a, b; cin >> a >> b;
if (pp[a]) cout << res[pp[a]][b] << endl;
else {
int tot = 0;
for (int v: comp[a])
tot += lower_bound(all(occ[b]), in[v]+sub[v])-lower_bound(all(occ[b]), in[v]);
cout << tot << endl;
}
}
}
