// recursion limit error が怖い
fun main() {
    val (n, q) = readLine()!!.split(" ").map { it.toInt() }
    val v = List(n) { mutableListOf<Int>() }
    repeat(n - 1) {
        val (a, b) = readLine()!!.split(" ").map { it.toInt() - 1 }
        v[a].add(b)
        v[b].add(a)
    }

    val subsiz = MutableList(n) { 0 }
    subsiz[0] = n

    fun dfs(now: Int) {
        subsiz[now] = 1
        for (next in v[now]) {
            if (subsiz[next] == 0) {
                dfs(next)
                subsiz[now] += subsiz[next]
            }
        }
    }

    dfs(0)

    var ans = 0L
    repeat(q) {
        val (p, x) = readLine()!!.split(" ").map { it.toInt() }
        ans += subsiz[p-1].toLong() * x
        println(ans)
    }
}