#include<bits/stdc++.h>
#define ll long long
using namespace std;
vector<int> par,B;
vector<vector<int>> A;
vector<vector<pair<int,int>>> C;
vector<pair<ll,ll>> r;
ll cnt=0;
void dfs(int u,int p){
r[u].first=cnt++;
for(auto v:A[u]){
if(v!=p) dfs(v,u);
}
r[u].second=cnt++;
C[B[u]].push_back({r[u].first,r[u].second});
}
int main(){
int n,q,R,i,j,k,x,y,a,b,r1,r2,ans;
cin>>n>>R>>q;
par.resize(n+1);
A.resize(n+1);
B.resize(n+1);
C.resize(R+1);
r.resize(n+1);
cin>>x;
B[1]=x;
for(i=2 ; i<=n ; i++){
cin>>par[i]>>x;
A[i].push_back(par[i]);
A[par[i]].push_back(i);
B[i]=x;
}
dfs(1,1);
for(i=1 ; i<=R ; i++){
sort(C[i].rbegin(),C[i].rend());
}
for(i=0 ; i<q ; i++){
cin>>r1>>r2;
ans=0;
for(auto v:C[r1]){
int ng1=C[r2].size();
int ok1=-1;
while(ng1-ok1>1){
int mid=(ng1+ok1)/2;
if(C[r2][mid].first>v.second) ok1=mid;
else ng1=mid;
}
int ok2=ng1-1;
int ng2=C[r2].size();
while(ng2-ok2>1){
int mid=(ng2+ok2)/2;
if(C[r2][mid].first<v.first) ng2=mid;
else ok2=mid;
}
ans+=ok2-ng1+1;
}
cout<<ans<<endl;
}
return 0;
}
