typedef long long ll;
#include <bits/stdc++.h>
#define pb push_back
using namespace std;
int n,sq,R,Q;
int renk[200001],fazlapos[25001],bas[200001],son[200001];
ll pre[25001][447],pre2[447][25001];
vector<int>child[200001],var[25001],sirali[25001];
ll cal(int a,int b){
if(sirali[b].size()==0||sirali[a].size()==0){
return 0;
}
if(sirali[b].size()>sq){
return pre[a][fazlapos[b]];
}
if(sirali[a].size()>sq){
return pre2[fazlapos[a]][b];
}
int sta[sirali[a].size()];
ll tavan=-1;
int apos=0;
ll ans=0;
for(int i=0;i<sirali[b].size();i++){
while(tavan!=-1&&son[sta[tavan]]<bas[var[b][i]]){
tavan--;
}
while(apos<sirali[a].size()&&bas[sirali[a][apos]]<=bas[var[b][i]]){
if(son[sirali[a][apos]]>=bas[var[b][i]]){
tavan++;
sta[tavan]=sirali[a][apos];
}
apos++;
}
ans+=tavan+1;
}
return ans;
}
int main(){
cin>>n>>R>>Q;
sq=sqrt(n);
cin>>renk[1];
int time=0;
sirali[renk[1]].pb(1);
for(int &x:fazlapos)
x=-1;
for(int i=2;i<=n;i++){
int par;cin>>par;
child[par].pb(i);
cin>>renk[i];
if(sirali[renk[i]].size()==sq){
fazlapos[renk[i]]=time;
time++;
}
sirali[renk[i]].pb(i);
}
function<ll(int,int)>f=[&](int pos,int tur)->ll{
ll res=0;
for(int x:child[pos]){
res+=f(x,tur);
}
if(renk[pos]==tur)return res+1;
pre[renk[pos]][fazlapos[tur]]+=res;
return res;
};
function<void(int,int,ll)>f2=[&](int pos,int tur,ll sum)->void{
if(renk[pos]!=tur)pre2[fazlapos[tur]][renk[pos]]+=sum;
else sum++;
for(int x:child[pos]){
f2(x,tur,sum);
}
};
for(int i=1;i<=R;i++){
if(fazlapos[i]==-1)continue;
f(1,i);
f2(1,i,0);
}
time=1;
function<void(int)>turla=[&](int pos)->void{
if(sirali[renk[pos]].size()<=sq){
bas[pos]=time;
var[renk[pos]].pb(pos);
}
time++;
for(int x:child[pos]){
turla(x);
}
son[pos]=time-1;
};
turla(1);
for(int i=1;i<=R;i++){
if(sirali[i].size()>sq)continue;
sort(sirali[i].begin(),sirali[i].end(),[&](const int &x,const int &y){
if(bas[x]==bas[y]){
return son[x]<son[y];
}
return bas[x]<bas[y];
});
}
while(Q--){
int a,b;cin>>a>>b;
cout<<cal(a,b)<<endl;
}
}
