#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <stack>
#include <tuple>
#include <deque>
#include <array>
#include <numeric>
#include <bitset>
#include <iomanip>
#include <cassert>
#include <chrono>
#include <random>
#include <limits>
#include <iterator>
#include <functional>
#include <sstream>
#include <fstream>
#include <complex>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
using namespace std;

// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
// #pragma GCC target("avx512f,avx512dq,avx512cd,avx512bw,avx512vl")

using ll = long long;
constexpr int INF = 1001001001;
constexpr int mod = 1000000007;
// constexpr int mod = 998244353;

template<class T>
inline bool chmax(T& x, T y){
    if(x < y){
        x = y;
        return true;
    }
    return false;
}
template<class T>
inline bool chmin(T& x, T y){
    if(x > y){
        x = y;
        return true;
    }
    return false;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N, Q;
    cin >> N >> Q;
    vector<vector<int>> g(N);
    for(int i = 1; i < N; ++i){
        int a, b;
        cin >> a >> b;
        --a, --b;
        g[a].emplace_back(b);
        g[b].emplace_back(a);
    }
    
    vector<int> subtree_size(N, 1);
    auto dfs = [&](auto&& self, int from = 0, int par = -1) -> int {
        for(int to : g[from]){
            if(to != par)   subtree_size[from] += self(self, to, from);
        }
        return subtree_size[from];
    };
    dfs(dfs);
    
    ll ans = 0;
    for(int q = 0; q < Q; ++q){
        int p, x;
        cin >> p >> x;
        ans += 1LL * x * subtree_size[p - 1];
        cout << ans << '\n';
    }

    return 0;
}