#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define pb push_back
#define pa pair<int, int>
#define pall pair<ll, int>
#define fi first
#define se second
#define TASK "test"
#define all(x) x.begin(), x.end()
using namespace std;
template<typename T1, typename T2> bool mini (T1 &a, T2 b) {if(a > b) a = b; else return 0; return 1;}
template<typename T1, typename T2> bool maxi (T1 &a, T2 b) {if(a < b) a = b; else return 0; return 1;}
const int MOD = 1e9 + 7;
const int LOG = 20;
const int maxn = 2e5 + 7;
const ll oo = 1e18 + 69;
const int sz = 450 + 7;
const int m = 25e3 + 7;
int n, st[maxn], en[maxn], timer = 0, a[maxn], r, q, home[maxn], cnt[maxn], r1, r2, f[sz][m], mp[sz];
vector<int> g[maxn], tp[maxn], cp[m], large;
void dfs(int u, int par) {
st[u] = ++timer;
cp[home[u]].pb(timer);
for(int i = 0; i < large.size(); i++) f[i][home[u]] += mp[large[i]];
for(auto v:g[u]) {
if(v == par) continue;
mp[home[v]]++;
dfs(v, u);
mp[home[v]]--;
}
en[u] = timer;
}
int get(int l, int r, int col) {
return upper_bound(all(cp[col]), r) - lower_bound(all(cp[col]), l);
}
int main() {
//ios_base::sync_with_stdio(false);
//cin.tie(NULL);
//freopen(TASK".inp", "r", stdin);
//freopen(TASK".out", "w", stdout);
cin>>n>>r>>q;
cin>>home[1];
cnt[home[1]]++;
for(int i = 2; i <= n; i++) {
int x;
cin>>x>>home[i];
cnt[home[i]]++;
g[x].pb(i);
}
mp[home[1]]++;
for(int i = 1; i <= n; i++)
if(cnt[home[i]] <= sz) tp[home[i]].pb(i);
for(int i = 1; i <= r; i++)
if(cnt[i] > sz) large.pb(i);
dfs(1, 0);
while(q--) {
cin>>r1>>r2;
if(cnt[r1] <= sz) {
int ans = 0;
for(auto u:tp[r1]) {
ans += get(st[u], en[u], r2) - (r1 == r2);
}
cout<<ans<<endl;
} else {
int id = lower_bound(all(large), r1) - large.begin();
cout<<f[id][r2]<<endl;
}
}
return 0;
}
