#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
#define mem(a,v) memset((a), (v), sizeof (a))
#define enl printf("\n")
#define case(t) printf("Case #%d: ", (t))
#define ni(n) scanf("%d", &(n))
#define nl(n) scanf("%I64d", &(n))
#define nai(a, n) for (int i = 0; i < (n); i++) ni(a[i])
#define nal(a, n) for (int i = 0; i < (n); i++) nl(a[i])
#define pri(n) printf("%d\n", (n))
#define prl(n) printf("%I64d\n", (n))
#define pii pair<int, int>
#define pil pair<int, long long>
#define pll pair<long long, long long>
#define vii vector<pii>
#define vil vector<pil>
#define vll vector<pll>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef cc_hash_table<int,int,hash<int>> ht;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> oset;
const double pi = acos(-1);
const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;
const int MAXN = 2e5 + 5;
const int MAXR = 3e4 + 5;
const int MAGIC = 400;
const double eps = 1e-9;
int par[MAXN], col[MAXN], cnt[MAXN];
vi ans[MAXR];
vi adj[MAXN], ind[MAXR], idx[MAXR];
int n, r, q, t = 0, st[MAXN], en[MAXN];
//map<pii,int> dp;
void dfs(int u, int x, int d) {
int fl = 0;
if (col[u] == x)
fl++;
for (int v: adj[u])
dfs(v, x, d + fl);
ans[x][col[u]] += d;
}
void dfs(int u) {
st[u] = t++;
ind[col[u]].pb(st[u]);
idx[col[u]].pb(u);
for (int v: adj[u])
dfs(v);
en[u] = t;
}
int main() {
scanf("%d %d %d", &n, &r, &q);
scanf("%d", &col[0]);
for (int i = 1; i < n; i++) {
scanf("%d %d", &par[i], &col[i]);
adj[--par[i]].pb(i);
cnt[col[i]]++;
}
dfs(0);
for (int i = 1; i <= r; i++)
if (cnt[i] > MAGIC) {
ans[i].resize(r + 2);
dfs(0, i, 0);
}
while (q--) {
int x, y;
scanf("%d %d", &x, &y);
if (cnt[x] <= MAGIC) {
/*if (dp.count(mp(x, y))) {
printf("%d\n", dp[mp(x, y)]);
fflush(stdout);
continue;
}*/
int anscnt = 0;
for (int j = 0; j < idx[x].size(); j++) {
int lo = lower_bound(ind[y].begin(), ind[y].end(), st[idx[x][j]]) - ind[y].begin();
int hi = lower_bound(ind[y].begin(), ind[y].end(), en[idx[x][j]]) - ind[y].begin();
anscnt += hi - lo;
}
printf("%d\n", anscnt);
//dp[mp(x, y)] = anscnt;
fflush(stdout);
} else {
printf("%d\n", ans[x][y]);
fflush(stdout);
}
}
return 0;
}
