#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;
using mint = modint998244353;

vector<vector<ll>> g;
vector<ll> cnt;
vector<ll> B;

void f(int i) {
  B[i] = 1;
  for (ll j: g[i]) {
    if (B[j] == 0) {
      f(j);
      cnt[i] += cnt[j];
    }
  }
}
int main() {
  ll N, Q, a, b, ans = 0, p, x;
  cin >> N >> Q;
  g.resize(N);
  cnt.resize(N);
  B.resize(N);
  for (int i = 0; i < N - 1; i++) {
    cnt[i] = 1;
    cin >> a >> b;
    a--, b--;
    g[a].push_back(b);
    g[b].push_back(a);
  }
  cnt[N - 1] = 1;
  f(0);
  for (int i = 0; i < Q; i++) {
    cin >> p >> x;
    p--;
    ans += cnt[p] * x;
    cout << ans << endl;
  }
  return 0;
}