#include <bits/stdc++.h>
using namespace std;
const int N = 2e5 + 5;
const int R = 25e3 + 5;
const int Q = 2e5 + 5;
int n, r, q;
int home[N], par[N];
vector<int> adj[N];
const int R1 = 505;
map<int, int> mp[N];
int pre[R1][R1];
void dfs(int u, int p) {
for (int v : adj[u]) {
if (v == p) continue;
dfs(v, u);
if (mp[u].size() < mp[v].size()) swap(mp[u], mp[v]);
for (auto i : mp[v]) mp[u][i.first] += i.second;
}
for (auto i : mp[u]) {
pre[home[u]][i.first] += i.second;
}
mp[u][home[u]]++;
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> r >> q;
cin >> home[1];
for (int i = 2; i <= n; i++) {
cin >> par[i] >> home[i];
adj[par[i]].push_back(i);
adj[i].push_back(par[i]);
}
if (r < R1) {
dfs(1, 0);
while (q--) {
int r1, r2;
cin >> r1 >> r2;
cout << pre[r1][r2] << endl;
}
} else {
assert(false);
}
}
