from functools import cache
from math import inf
import sys
sys.setrecursionlimit(500000)


def printe(*args, end="\n", **kwargs):
    print(*args, end=end, file=sys.stderr, **kwargs)


def main():
    N, Q = map(int, input().split())
    tree = [set() for _ in range(N)]
    for _ in range(N - 1):
        a, b = map(lambda n: int(n) - 1, input().split())
        tree[a].add(b)
        tree[b].add(a)
    tree_size = [inf for _ in range(N)]

    @cache
    def dfs_size(start_idx: int, parent: int = -1) -> int:
        cur_size = 1
        for neighbor in tree[start_idx]:
            if neighbor == parent:
                continue
            cur_size += dfs_size(neighbor, start_idx)
        tree_size[start_idx] = cur_size
        return cur_size

    dfs_size(0)

    total_cost = 0
    for _ in range(Q):
        p, x = map(int, input().split())
        p -= 1
        total_cost += tree_size[p] * x
        print(total_cost)


if __name__ == "__main__":
    main()