import sys import math from collections import deque,Counter from sys import stdin #sys.setrecursionlimit(10**7) int1=lambda x: int(x)-1 inp=lambda :int(input()) mi=lambda :map(int,input().split()) li=lambda :list(mi()) mi1=lambda :map(int1,input().split()) li1=lambda :list(mi1()) mis=lambda :map(str,input().split()) lis=lambda :list(mis()) stinput=lambda :stdin.readline()[:-1] stinp=lambda :int(stinput()) stmi=lambda :map(int, stdin.readline().split()) stli=lambda :list(stmi()) stmi1=lambda :map(int1, stdin.readline().split()) stli1=lambda :list(stmi1()) stmis=lambda :stdin.readline()[:-1] pr=print from collections import defaultdict """ #初期値 0 d=defaultdict(int) #初期値 1 d=defaultdict(lambda:1) """ mod=10**9+7 Mod=998244353 INF=10**18 ans=0 n,q=mi() edge=[[] for i in range(n)] for i in range(n-1): a,b=mi1() edge[a].append(b) edge[b].append(a) cnt=[0]*n seen=[False]*n def dfs(x): seen[x]=True tmp=1 for i in edge[x]: if seen[i]==False: tmp+=dfs(i) cnt[x]=tmp return tmp dfs(0) for i in range(q): p,x=mi() ans+=cnt[p-1]*x print(ans)