#include <bits/stdc++.h>
using namespace std;

struct iofast_t {
    iofast_t() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} iofast;

struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
    if constexpr (sizeof...(Args) == 0) return std::vector(arg, init);
    else return std::vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
    return vec(Element(), arg, args...);
}

template <typename T, typename Compare = less<T>>
T &chmin(T &l, T r, Compare &&f = less<T>()) { return l = min(l, r, f); }
template <typename T, typename Compare = less<T>>
T &chmax(T &l, T r, Compare &&f = less<T>()) { return l = max(l, r, f); }

int main() {
    int n, q; cin >> n >> q;

    auto g = vec<int>(uns, n, 0);
    for (int i = 1; i < n; ++i) {
        int a, b; cin >> a >> b; --a; --b;
        g[a].push_back(b);
        g[b].push_back(a);
    }

    auto c = vec<int>(0, n);

    auto dfs = [&](auto &&self, int v, int p = -1) -> int {
        c[v] = 1;
        for (auto u : g[v]) {
            if (u == p) {
                continue;
            }
            c[v] += self(self, u, v);
        }
        return c[v];
    };
    dfs(dfs, 0);

    int64_t sum = 0;
    while (q--) {
        int p, x; cin >> p >> x; --p;
        sum += int64_t(x) * c[p];

        cout << sum << endl;
    }
}