#include<bits/stdc++.h>
using namespace std;
int N,Q;
vector<vector<long long>>G(N+3);
vector<long long>cnt(N+3);
vector<long long>B(N+3);
void f(int i){
  B[i]=1;
  for(long long j:G[i]){
    if(B[j]==0){
      f(j);
      cnt[i]=cnt[i]+cnt[j];
    }
  }
  return;
}
int main(){
  cin>>N>>Q;
  int answer=0;
  for(int i=0;i<N-1;i++){
    int A,B;
    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++){
    int P,X;
    cin>>P>>X;
    answer=answer+cnt[P-1]*X;
    cout<<answer<<endl;
  }
  
}