#include<bits/stdc++.h>
#define cir(i,a,b) for(int i=a;i<b;++i)
using namespace std;
using lint=long long;
using VI=vector<int>;
using VL=vector<lint>;
vector<VI> G;vector<VL> cx;
VI tin,tout,w,col;
void dfs(int u,int&cnx,int f=0){
tin[u]=cnx++;
for(auto&i:G[u]) if(i!=f) dfs(i,cnx,u);
tout[u]=cnx;
}
bool isancestor(int u,int v){
return tin[u]<=tin[v]&&tout[v]<=tout[u];
}
void dfsx(int u,int ci,int wx=0,int f=0){
w[u]=(wx+=(col[u]==ci));
for(auto&i:G[u]) if(i!=f) dfsx(i,ci,wx,u);
}
void init(int n){
G.resize(n+1);tin.resize(n+1);col.resize(n+1);
tout.resize(n+1);w.resize(n+1);
}
int main(){
ios::sync_with_stdio(false),cin.tie(0);
int n,r,q;cin>>n>>r>>q;init(n);
const int sqr=pow<double>(n,3.0/1.0)+1;
VL cnx(r+1),idx(n+1);
vector<VI> ci(r+1);
cin>>col[1];cnx[col[1]]++;ci[col[1]].push_back(1);
cir(i,2,n+1){
int f;cin>>f>>col[i];cnx[col[i]]++;
G[f].push_back(i);G[i].push_back(f);
ci[col[i]].push_back(i);
}
[&](){int ncnx=0;dfs(1,ncnx);}();
cir(i,1,r+1) if(col[i]>sqr){
idx[i]=cx.size();cx.push_back(VL(r+1));
fill(w.begin(),w.end(),0);
dfsx(1,i);
cir(i,1,n+1) cx[idx[i]][col[i]]+=w[i];
}
auto bfdis=[&](int c1,int c2){
lint res=0;
for(auto&i:ci[c1]) for(auto&j:ci[c2])
res+=isancestor(i,j);
return res;
};
cir(i,0,q){
int r1,r2;cin>>r1>>r2;
if(cnx[r1]>sqr) cout<<cx[idx[r1]][r2]<<'\n';
else if(cnx[r2]>sqr) cout<<cnx[r1]*cnx[r2]-cx[idx[r2]][r1]<<'\n';
else cout<<bfdis(r1,r2)<<'\n';
cout.flush();
}
return 0;
}
