#include <bits/stdc++.h>
using namespace std;
#ifdef DEBUG
auto&operator<<(auto &o, pair<auto, auto> p) {o << "(" << p.first << ", " << p.second << ")"; return o;}
auto operator<<(auto &o, auto x)->decltype(x.end(), o) {o<<"{"; for(auto e : x) o<<e<<", "; return o<<"}";}
#define debug(X) cerr << "["#X"]: " << X << '\n';
#else
#define debug(X) ;
#endif
#define ll long long
#define all(v) (v).begin(), (v).end()
#define FOR(i,l,r) for(int i=(l);i<=(r);++i)
#define ROF(i,r,l) for(int i=(r);i>=(l);--i)
#define REP(i,n) FOR(i,0,(n)-1)
#define ssize(x) int(x.size())
#define fi first
#define se second
#define eb emplace_back
int main () {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, r, q;
cin >> n >> r >> q;
vector<int> h(n);
vector G(n, vector(0, 0)), wyst(r, vector(0, 0)), wyst2(r, vector(0, 0));
cin >> h[0];
h[0]--;
wyst2[h[0]].eb(0);
FOR(i, 1, n-1) {
int p;
cin >> p >> h[i];
p--;
h[i]--;
wyst2[h[i]].eb(i);
G[p].eb(i);
G[i].eb(p);
}
const int B = 4*(int(sqrt(r)));
vector<int> big, bigIdx(n, -1);
vector<int> start(n), end(n), s(n);
int timer = 0;
function<void(int, int)> dfs2 = [&](int v, int p) {
start[v] = timer++;
s[v] = 1;
wyst[h[v]].eb(start[v]);
for(auto w : G[v]) {
if (w == p) continue;
dfs2(w, v);
s[v] += s[w];
}
end[v] = timer-1;
};
dfs2(0, -1);
debug(start);
debug(end);
debug(wyst);
REP(i, r) {
if (ssize(wyst[i]) > B) {big.eb(i); bigIdx[i] = ssize(big)-1;}
}
auto merge = [&](vector<int> &a, vector<int> &b) {
REP(i, ssize(big)) a[i] += b[i];
return;
};
vector ans(r, vector(ssize(big), 0ll));
function<vector<int>(int, int)> dfs = [&](int v, int p) {
vector<int> cnt(ssize(big));
for(auto w : G[v]) {
if (w == p) continue;
vector<int> b = dfs(w, v);
merge(cnt, b);
}
REP(i, ssize(big)) ans[h[v]][i] += cnt[i];
if(bigIdx[h[v]] >= 0) cnt[bigIdx[h[v]]]++;
return cnt;
};
dfs(0, -1);
REP(j, q) {
int r1, r2;
cin >> r1 >> r2;
r1--; r2--;
if (bigIdx[r1] >= 0) {
cerr << "CASE 1 \n";
cout << ans[r1][bigIdx[r2]] << '\n';
cout.flush();
continue;
}
cerr << "CASE 2 \n";
ll res = 0;
for (auto v : wyst2[r1]) {
auto up = upper_bound(all(wyst[r2]), end[v])-1, low = lower_bound(all(wyst[r2]), start[v]);
cerr << v << ' ' << up-wyst[r2].begin() << ' ' << low-wyst[r2].begin() << '\n';
res += up-low+1;
}
cout << res << '\n';
cout.flush();
}
return 0;
}
