#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int NMAX = 2e5;
const int RMAX = 25000;
const int BLOCK = 500;
int n, r, q, t;
int reg[NMAX + 1];
int freq[RMAX + 1];
int in[NMAX + 1], out[NMAX + 1];
int sp[NMAX + 1];
vector<int> g[NMAX + 1], in_reg[RMAX + 1], out_reg[RMAX + 1], nodes_reg[RMAX + 1];
void DFS(int node, int dad = 0) {
in[node] = ++t;
in_reg[reg[node]].push_back(in[node]);
for(int next_node : g[node]) {
if(next_node != dad) {
DFS(next_node, node);
}
}
out[node] = t;
out_reg[reg[node]].push_back(out[node]);
}
int lower_bound_in(vector<int>& a, vector<int>& b) {
int sz_a = a.size(), sz_b = b.size(), i = 0, j = 0, answer = 0;
while(i < sz_a && j < sz_b) {
if(a[i] <= b[j]) {
answer += sz_b - j;
i++;
}
else {
j++;
}
}
return answer;
}
int upper_bound_out(vector<int>& a, vector<int>& b) {
int sz_a = a.size(), sz_b = b.size(), i = 0, j = 0, answer = 0;
while(i < sz_a && j < sz_b) {
if(a[i] < b[j]) {
answer += sz_b - j;
i++;
}
else {
j++;
}
}
return answer;
}
int query_both_small(int r1, int r2) {
return lower_bound_in(in_reg[r1], in_reg[r2]) - upper_bound_out(out_reg[r1], in_reg[r2]);
}
int query_small(int r1, int r2) {
int answer = 0;
for(int node : nodes_reg[r1]) {
auto itr = upper_bound(in_reg[r2].begin(), in_reg[r2].end(), out[node]);
auto itl = lower_bound(in_reg[r2].begin(), in_reg[r2].end(), in[node]);
answer += itr - itl;
}
return answer;
}
int query_big(int r1, int r2) {
/// Activate r2
/// Query r1
fill(sp + 1, sp + n + 1, 0);
for(int node : nodes_reg[r2]) {
sp[in[node]]++;
}
for(int i = 1; i <= n; i++) {
sp[i] += sp[i - 1];
}
int answer = 0;
for(int node : nodes_reg[r1]) {
answer += sp[out[node]] - sp[in[node] - 1];
}
return answer;
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> n >> r >> q;
cin >> reg[1];
for(int i = 2; i <= n; i++) {
int x;
cin >> x >> reg[i];
g[x].push_back(i);
g[i].push_back(x);
}
for(int i = 1; i <= n; i++) {
freq[reg[i]]++;
nodes_reg[reg[i]].push_back(i);
}
DFS(1);
while(q--) {
int r1, r2;
cin >> r1 >> r2;
if(freq[r1] <= BLOCK && freq[r2] <= BLOCK) {
cout << query_both_small(r1, r2) << endl;
}
else if(freq[r1] <= BLOCK) {
cout << query_small(r1, r2) << endl;
}
else {
cout << query_big(r1, r2) << endl;
}
}
return 0;
}
