#ifdef ONPC
#define _GLIBCXX_DEBUG
#endif
#include <bits/stdc++.h>
#ifndef ONPC
#pragma GCC target("avx")
#pragma GCC target("popcnt")
#define cerr if (false) cerr
#endif
using namespace std;
#define all(v) begin(v), end(v)
#define watch(x) cerr << #x << ": " << x << endl;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> Pint;
typedef pair<ll, ll> Pll;
mt19937_64 gen64(chrono::steady_clock::now().time_since_epoch().count());
inline ll rnd(ll l = LLONG_MIN, ll r = LLONG_MAX) {
return uniform_int_distribution<ll>(l, r)(gen64);
}
template<class T>
bool umin(T &a, const T &b) {
return (a > b ? a = b, true : false);
}
template<class T>
bool umax(T &a, const T &b) {
return (a < b ? a = b, true : false);
}
const int mod = 1e9 + 7;
ll mult(ll a, ll b) {
return (a * b) % mod;
}
template<class T>
void add(T &a, const T &b) {
a = (a + b) % mod;
}
const int inf = int(1e9) + 10;
const ll INF = ll(1e18) + 10;
const int maxn = 2e5 + 5, maxr = 25000 + 5;
constexpr int W = 400;
ll prc[maxn / W + 10][maxr];
using state = map<int, ll>;
void merge(state &a, state &b) {
if (a.size() < b.size()) {
swap(a, b);
}
for (auto [c, f] : b) {
a[c] += f;
}
}
vector<int> g[maxn];
int c[maxn], f[maxr];
int idx[maxr], tin[maxn], tout[maxn], timer = 0;
void dfs(int v = 1, int p = -1) {
tin[v] = ++timer;
state cur;
for (int u : g[v]) {
if (u != p) {
dfs(u, v);
}
}
tout[v] = timer;
}
void stupid(int x, int v = 1, int p = -1, int d = 0) {
prc[idx[x]][c[v]] += d;
d += (c[v] == x);
for (int u : g[v]) {
if (u != p) {
stupid(x, u, v, d + 1);
}
}
}
void solve() {
int n, r, q;
cin >> n >> r >> q;
vector<vector<int>> a(r + 1);
for (int v = 1; v <= n; ++v) {
if (v != 1) {
int p;
cin >> p;
g[p].push_back(v);
}
cin >> c[v]; c[v]--;
f[c[v]]++;
a[c[v]].push_back(v);
}
int cur = 0;
dfs();
for (int x = 0; x < r; ++x) {
if (f[x] > W) {
idx[x] = cur++;
stupid(x);
}
}
vector<int> euler(n + 1);
for (int v = 1; v <= n; ++v) {
euler[tin[v]] = c[v];
}
vector<vector<int>> b(r);
for (int i = 1; i <= n; ++i) {
b[euler[i]].push_back(i);
}
while (q--) {
int r1, r2;
cin >> r1 >> r2; r1--, r2--;
if (f[r1] > W) {
cout << prc[idx[r1]][r2] << endl;
} else {
ll ans = 0;
for (int v : a[r1]) {
ans += upper_bound(all(b[r2]), tout[v]) - lower_bound(all(b[r2]), tin[v]);
}
cout << ans << endl;
}
}
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int t = 1;
// cin >> t;
while (t--) {
solve();
}
return 0;
}
