#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int mxN = 2e5+10;
const int mxR = 3e4+10;
int reg[mxN], bit[mxN];
vector<int> adj[mxN], emp[mxR];
int tin[mxN], tout[mxN], timer = 0;
void dfs(int node, int p) {
tin[node] = ++timer;
for(auto it : adj[node]) {
if(it == p) continue;
dfs(it, node);
}
tout[node] = timer;
}
void upd(int k, int x) {
for(k; k < mxN; k += ((k) & (-k))) {
bit[k] += x;
}
}
int qry(int k) {
int ans = 0;
for(; k >= 1; k -= ((k) & (-k))) {
ans += bit[k];
}
return ans;
}
int main()
{
int n, r, q;
cin >> n >> r >> q;
cin >> reg[1];
emp[reg[1]].push_back(1);
for(int i = 2; i <= n; i++) {
int p;
cin >> p >> reg[i];
emp[reg[i]].push_back(i);
adj[p].push_back(i);
adj[i].push_back(p);
}
dfs(1, 0);
while(q--) {
int r1, r2;
cin >> r1 >> r2;
int ans = 0;
for(auto it : emp[r2]) {
upd(tin[it], 1);
}
for(auto it : emp[r1]) {
ans += qry(tout[it])-qry(tin[it]-1);
}
for(auto it : emp[r2]) {
upd(tin[it], -1);
}
cout << ans << '\n';
cout.flush();
}
return 0;
}
