n,q = map(int,input().split())
l = [[] for _ in range(n)]
for _ in range(n-1):
    a,b = map(int,input().split())
    l[a-1].append(b-1)
    l[b-1].append(a-1)
ans = 0
ne = [1] + [0] * (n - 1)
def dfs(node):
    res = 1
    for nd in l[node]:
        if ne[nd] == 0:
            ne[nd] = 1
            res += dfs(nd)
    ne[node] = res
    return res
dfs(0)
for _ in range(q):
    p,x = map(int,input().split())
    ans += ne[p-1] * x
    print(ans)