#include <bits/stdc++.h>
using i64 = long long;
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int n, m, q;
std::cin >> n >> m >> q;
std::vector<std::vector<int>> e(n), c(m);
std::vector<int> a(n);
std::cin >> a[0];
for (int i = 1, p; i < n; i++) {
std::cin >> p >> a[i];
p--;
e[p].push_back(i);
}
for (int i = 0; i < n; i++) {
c[--a[i]].push_back(i);
}
std::vector<int> in(n), out(n);
int timeStamp = 0;
std::function<void(int)> dfs = [&](int u) {
in[u] = timeStamp++;
for (auto v : e[u]) {
dfs(v);
}
out[u] = timeStamp;
};
dfs(0);
auto is = [&](int u, int v) { return in[u] < in[v] && out[u] >= out[v]; };
while (q--) {
int r1, r2;
std::cin >> r1 >> r2;
r1--;
r2--;
int ans = 0;
for (auto u : c[r1]) {
for (auto v : c[r2]) {
if (is(u, v)) {
ans++;
}
}
}
std::cout << ans << std::endl;
}
return 0;
}
