#include <bits/stdc++.h>
using namespace std;
const int MAXN = 2e5;
const int MAXR = 25 * 1e3;
int r[MAXN], timer, in[MAXN], out[MAXN];
vector<int> G[MAXN], R[MAXR], pos[MAXR];
void dfs(int u) {
in[u] = ++timer;
pos[r[u]].emplace_back(in[u]);
for (int v : G[u])
dfs(v);
out[u] = timer;
}
int solve(int r1, int r2) {
int ans = 0;
for (int u : R[r1]) {
int n = pos[r2].size(), st, dr, step, aux;
for (step = 1; step < n; step <<= 1);
aux = step;
for (st = 0; step; step >>= 1) {
int ind = st | step;
if (ind <= n && pos[r2][ind - 1] < in[u])
st |= step;
}
step = aux;
for (dr = 0; step; step >>= 1) {
int ind = dr | step;
if (ind <= n && pos[r2][ind - 1] <= out[u])
dr |= step;
}
ans += dr - st;
}
return ans;
}
int main() {
int n, Q;
cin >> n >> Q >> Q;
for (int v = 0; v < n; ++v) {
if (v == 0) {
cin >> r[0];
--r[0];
R[r[0]].emplace_back(0);
continue;
}
int u;
cin >> u >> r[v];
--r[v];
G[u - 1].emplace_back(v);
R[r[v]].emplace_back(v);
}
dfs(0);
map<pair<int,int>,int> sol;
for (int q = 0; q < Q; ++q) {
int r1, r2;
cin >> r1 >> r2;
--r1, --r2;
pair<int,int> p{r1, r2};
auto it = sol.find(p);
if (it != sol.end())
cout << it->second << endl;
else {
int ans = solve(r1, r2);
sol[p] = ans;
cout << ans << endl;
}
}
return 0;
}
