#include <bits/stdc++.h>
using namespace std;
#define int long long int
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, r, q;
cin >> n >> r >> q;
vector<vector<int>> cnt(n+1, vector<int>(r+1,0));
vector<int> p(n+1),re(n+1);
vector<vector<int>> reg(r+1);
cin >> re[1];
reg[re[1]].push_back(1);
for (int i =2; i <= n; i++) {
cin >> p[i]>>re[i];
reg[re[i]].push_back(i);
}
for (int i = n; i >= 1;i--) {
cnt[i][re[i]]++;
for (int j = 1; j <= r; j++) {
cnt[p[i]][j]+=cnt[i][j];
}
}
map<pair<int, int>,int>mp;
for (int i =0; i < q; i++) {
int r1, r2;
cin >> r1 >> r2;
int ans = 0;
for (int j:reg[r1]) {
ans += cnt[j][r2];
}
cout << ans << "\n";
cout.flush();
}
//fclose(stdin);
//fclose(stdout);
return 0;
}
