#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vi = vector<int>;
using vl = vector<ll>;
#define pb push_back
#define rsz resize
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
using pi = pair<int,int>;
#define f first
#define s second
#define mp make_pair
const int MX = 200005;
const int MOD = (int) (1e9 + 7);
const ll INF = (ll) 1e18;
namespace output {
void pr(int x) {
cout << x;
}
void pr(long x) {
cout << x;
}
void pr(ll x) {
cout << x;
}
void pr(unsigned x) {
cout << x;
}
void pr(unsigned long x) {
cout << x;
}
void pr(unsigned long long x) {
cout << x;
}
void pr(float x) {
cout << x;
}
void pr(double x) {
cout << x;
}
void pr(long double x) {
cout << x;
}
void pr(char x) {
cout << x;
}
void pr(const char * x) {
cout << x;
}
void pr(const string & x) {
cout << x;
}
void pr(bool x) {
pr(x ? "true" : "false");
}
template < class T1, class T2 > void pr(const pair < T1, T2 > & x);
template < class T > void pr(const T & x);
template < class T, class...Ts > void pr(const T & t,
const Ts & ...ts) {
pr(t);
pr(ts...);
}
template < class T1, class T2 > void pr(const pair < T1, T2 > & x) {
pr("{", x.f, ", ", x.s, "}");
}
template < class T > void pr(const T & x) {
pr("{"); // const iterator needed for vector<bool>
bool fst = 1;
for (const auto & a: x) pr(!fst ? ", " : "", a), fst = 0;
pr("}");
}
void ps() {
pr("\n");
} // print w/ spaces
template < class T, class...Ts > void ps(const T & t,
const Ts & ...ts) {
pr(t);
if (sizeof...(ts)) pr(" ");
ps(ts...);
}
void pc() {
cout << "]" << endl;
} // debug w/ commas
template < class T, class...Ts > void pc(const T & t,
const Ts & ...ts) {
pr(t);
if (sizeof...(ts)) pr(", ");
pc(ts...);
}
#define dbg(x...) pr("[", #x, "] = ["), pc(x);
}
#ifdef LOCAL
using namespace output;
#endif
template <class T, int ...Ns> struct BIT {
T val = 0; void upd(T v) { val += v; }
T query() { return val; }
};
template <class T, int N, int... Ns> struct BIT<T, N, Ns...> {
BIT<T,Ns...> bit[N+1];
template<typename... Args> void upd(int pos, Args... args) { assert(pos > 0);
for (; pos<=N; pos+=pos&-pos) bit[pos].upd(args...); }
template<typename... Args> T sum(int r, Args... args) {
T res=0; for (;r;r-=r&-r) res += bit[r].query(args...);
return res; }
template<typename... Args> T query(int l, int r, Args...
args) { return sum(r,args...)-sum(l-1,args...); }
};
const int B = 500;
const int MXR = 25005;
vi adj[MX];
int nr[MX], p[MX], good[MXR], st[MX], sz[MX];
int cnt = 0;
BIT<int, MX> orz;
vi locs[MXR];
map<int, int> vals[MX];
map<pi, int> pre;
void dfs_init(int v, int p) {
st[v] = cnt++;
sz[v] = 1;
for (int to : adj[v]) {
if (to != p) {
dfs_init(to, v);
sz[v] += sz[to];
}
}
}
void comb(map<int, int> &a, map<int, int> &b) {
if (sz(a) < sz(b)) swap(a, b);
for (auto x : b) a.insert(x);
b.clear();
}
void dfs_merge(int v, int p) {
if (good[nr[v]]) vals[v][nr[v]]++;
for (int to : adj[v]) {
if (to != p) {
dfs_merge(to, v);
comb(vals[v], vals[to]);
}
}
if (!good[nr[v]]) {
for (auto x : vals[v]) {
pre[mp(nr[v], x.f)] += x.s;
}
}
}
void dfs_path(int v, int p, map<int, int> &curr) {
for (auto x : curr) {
pre[mp(x.f, nr[v])] += x.s;
}
for (int to : adj[v]) {
if (to != p) {
curr[nr[to]]++;
dfs_path(to, v, curr);
curr[nr[to]]--;
}
}
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
int n, r, q; cin >> n >> r >> q;
for (int i = 0; i < n; i++) {
if (i) {
cin >> p[i];
p[i]--;
}
cin >> nr[i];
nr[i]--;
good[nr[i]]++;
locs[nr[i]].pb(i);
}
for (int i = 1; i < n; i++) {
adj[p[i]].pb(i);
}
for (int i = 0; i < r; i++) {
if (good[i] >= B) good[i] = 0;
else good[i] = 1;
}
dfs_init(0, -1);
dfs_merge(0, -1);
map<int, int> init;
dfs_path(0, -1, init);
for (int i = 0; i < q; i++) {
int qu, qv; cin >> qu >> qv;
qu--, qv--;
if (good[qu] && good[qv]) {
int ret = 0;
for (auto p : locs[qv]) {
orz.upd(st[p] + 1, 1);
// dbg(st[p], 1);
}
for (auto p : locs[qu]) {
ret += orz.query(st[p] + 1, st[p] + sz[p]);
// dbg(st[p], st[p] + sz[p] - 1);
}
for (auto p : locs[qv]) {
orz.upd(st[p] + 1, -1);
// dbg(st[p], -1);
}
cout << ret << endl;
} else {
assert(pre.find(mp(qu, qv)) != pre.end());
cout << pre[mp(qu, qv)] << endl;
}
}
}
