import sys
import io, os
input = sys.stdin.buffer.readline
#input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline

mod = 10**9+7

def main():
    n = int(input())
    g = [[] for _ in range(n)]
    ind = [[] for _ in range(n)]
    for i in range(n-1):
        a, b = map(int, input().split())
        a, b = a-1, b-1
        g[a].append(b)
        ind[b].append(a)

    root = -1
    for i in range(n):
        if len(ind[i]) == 0:
            root = i
            break

    s = []
    s.append(root)
    order = []
    par = [-1]*n
    depth = [0]*n
    while s:
        v = s.pop()
        order.append(v)
        for u in g[v]:
            if u == par[v]:
                continue
            par[u] = v
            s.append(u)
            depth[u] = depth[v]+1

    #print(depth)
    ans = 0
    for i in range(n):
        d = depth[i]
        ans += d*(d+1)//2
        ans %= mod
    print(ans)

if __name__ == '__main__':
    main()