import sys

def input(): return sys.stdin.readline().strip()
def list2d(a, b, c): return [[c] * b for i in range(a)]
def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)]
def list4d(a, b, c, d, e): return [[[[e] * d for j in range(c)] for j in range(b)] for i in range(a)]
def ceil(x, y=1): return int(-(-x // y))
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)]
def Yes(): print('Yes')
def No(): print('No')
def YES(): print('YES')
def NO(): print('NO')
sys.setrecursionlimit(10 ** 9)
INF = 10 ** 19
MOD = 10 ** 9 + 7
EPS = 10 ** -10

N, p = MAP()

if N == 1:
    print(0)
    exit()

A = [0] * N
A[1] = 1
for i in range(2, N):
    A[i] = (A[i-1]*p + A[i-2]) % MOD

acc = [0] * N
acc[-1] = A[-1]
for i in range(N-2, -1, -1):
    acc[i] = (acc[i+1] + A[i]) % MOD

ans = 0
for i in range(N):
    ans += (A[i] * acc[i])
    ans %= MOD
print(ans)