#include <bits/stdc++.h>
using namespace std;
const int MAXN = 2e5;
vector<vector<int>> adj(MAXN);
vector<int> r(MAXN);
vector<vector<int>> tin_regions(MAXN);
vector<int> tin(MAXN), tout(MAXN), tin_to_node(MAXN);
int timer = 0;
map<int, map<int, int>> computed;
int main() {
int n, rcnt, q; cin >> n >> rcnt >> q;
cin >> r[0];
--r[0];
for(int i = 1; i <= n - 1; ++i) {
int p, h; cin >> p >> h;
--p; --h;
r[i] = h;
adj[p].push_back(i);
}
function<void(int, int)> euler = [&](int u, int p) -> void {
tin_regions[r[u]].push_back(timer);
tin_to_node[timer] = u;
tin[u] = timer++;
for(int v : adj[u]) {
if(v == p) continue;
euler(v, u);
}
tout[u] = timer;
};
euler(0, -1);
function<void(int, int, int)> dfs = [&](int u, int region, int region_cnt) -> void {
if(r[u] == region) region_cnt++;
else computed[region][r[u]] += region_cnt;
for(int v : adj[u]) dfs(v, region, region_cnt);
};
const int block = sqrt(n);
for(int i = 0; i < rcnt; ++i) {
if((int)tin_regions[i].size() >= block) {
dfs(0, i, 0);
}
}
while(q--) {
int u, v; cin >> u >> v;
--u; --v;
if((int)tin_regions[u].size() >= block) cout << computed[u][v] << "\n";
else {
int res = 0;
for(int t : tin_regions[u]) {
int node = tin_to_node[t];
res +=
lower_bound(tin_regions[v].begin(), tin_regions[v].end(), tout[node]) -
lower_bound(tin_regions[v].begin(), tin_regions[v].end(), tin[node]);
}
cout << res << "\n";
}
}
}
