#pragma GCC optimize ("Ofast")
#pragma GCC target ("avx2")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define all(x) x.begin(), x.end()
#define pb push_back
#define vi vector<int>
#define vvi vector<vi>
const int R2 = 550;
int n, r, q, curr;
vi reg, sz, pre, idx;
ll ans[R2][R2];
vvi adj, from, pos;
void init() {
reg.resize(n);
sz.resize(n);
pre.resize(n);
idx.resize(n);
adj.resize(n);
from.resize(r);
pos.resize(r);
}
void dfs(int u) {
sz[u] = 1;
pre[curr] = reg[u];
pos[reg[u]].pb(curr);
idx[u] = curr;
curr++;
for (int &v : adj[u]) {
dfs(v);
sz[u] += sz[v];
}
}
int query(int a, int b, int c) {
int l = lower_bound(all(pos[c]), a) - pos[c].begin();
int r = upper_bound(all(pos[c]), b) - pos[c].begin();
return r-l;
}
signed main() {
ios::sync_with_stdio(false); cin.tie(nullptr);
cin >> n >> r >> q;
init();
for (int i = 0; i < n; i++) {
if (i) {
int x;
cin >> x;
x--;
adj[x].pb(i);
}
cin >> reg[i];
reg[i]--;
from[reg[i]].pb(i);
}
curr = 0;
dfs(0);
if (r <= R2) {
// precalc all queries
for (int i = 0; i < r; i++) {
for (int j = 0; j < r; j++) {
if (i == j) continue;
ans[i][j] = 0;
for (int &u : from[i]) {
ans[i][j] += query(idx[u], idx[u] + sz[u] - 1, j);
}
}
}
}
while (q--) {
int x, y;
cin >> x >> y;
x--; y--;
if (r <= R2) {
cout << ans[x][y] << endl;
}
else {
ll cnt = 0;
for (int &u : from[x]) {
cnt += query(idx[u], idx[u] + sz[u] - 1, y);
}
cout << cnt << endl;
}
}
}
