import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N, P = getlist()
	Alist = [0, 0, 1]
	for i in range(N):
		Alist.append((Alist[-1] * P + Alist[-2]) % con)

	# print(Alist)

	ans = 0
	edge = 0
	for i in range(1, N + 1):
		edge += Alist[i]
		edge %= con
	ans = (edge ** 2) % con

	for i in range(1, N + 1):
		ans += Alist[i] ** 2
		ans %= con

	ans = ans * pow(2, con - 2, con)
	print(ans % con)

if __name__ == '__main__':
	main()