#include<bits/stdc++.h>
using namespace std;
int main(){
ios_base::sync_with_stdio(false); cin.tie(nullptr);
int N, R, Q;
cin >> N >> R >> Q;
vector<vector<int>> adj(N+1);
vector<int> region(N+1);
vector<vector<int>> comp(R+1);
cin >> region[1];
for(int i = 2; i <= N; ++i){
int x; cin >> x;
adj[x].push_back(i);
cin >> region[i];
}
int timer(0);
vector<int> in(N+1), out(N+1), euler(N+1);
function<void(int)> dfs = [&](int node){
in[node] = timer++;
euler[in[node]] = node;
comp[region[node]].push_back(in[node]);
for(int x : adj[node])
dfs(x);
out[node] = timer;
};
dfs(1);
for(int i = 0; i < Q; ++i){
int r1, r2; cin >> r1 >> r2;
int ans(0);
for(int x : comp[r1])
ans += lower_bound(comp[r2].begin(), comp[r2].end(), out[euler[x]]) - lower_bound(comp[r2].begin(), comp[r2].end(), x);
cout << ans << '\n';
fflush(stdout);
}
}
