#include <bits/stdc++.h>
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
//#define int long long
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 2e5 + 5;
const double eps = 1e-9;
void setIO() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
}
int n, r, q, home[maxn], in[maxn], out[maxn], timer = 0;
vector<vector<int> > graph;
vector<vector<pii> > by_home;
void dfs(int u) {
in[u] = timer++;
for(int &v : graph[u])
dfs(v);
out[u] = timer;
}
int32_t main() {
setIO();
cin >> n >> r >> q;
graph.resize(n+1);
by_home.resize(r+1);
cin >> home[1];
for(int i=2; i<=n; i++) {
int p;
cin >> p >> home[i];
graph[p].push_back(i);
}
dfs(1);
for(int i=1; i<=n; i++)
by_home[home[i]].push_back({ in[i], out[i] });
for(int i=1; i<=r; i++)
sort(all(by_home[i]));
while(q--) {
int r1, r2, ans = 0;
cin >> r1 >> r2;
for(pii &u : by_home[r1]) {
//cout << u.first << " " << u.second << '\n';
int l=0, r=sz(by_home[r2])-1;
int p1 = 1e9;
while(l <= r) {
int mid = (l + r) / 2;
if(by_home[r2][mid].first > u.first) p1 = mid, r = mid - 1;
else l = mid + 1;
}
if(p1 == 1e9) continue;
l=p1, r=sz(by_home[r2])-1;
int p2 = 1e9;
while(l <= r) {
int mid = (l + r) / 2;
if(by_home[r2][mid].first < u.second) p2 = mid, l = mid + 1;
else r = mid - 1;
}
if(p2 == 1e9) continue;
ans += (p2 - p1 + 1);
}
cout << ans << '\n';
}
return 0;
}
