#region Header
#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
from queue import PriorityQueue
import bisect
import heapq

def input():
    return sys.stdin.readline()[:-1]

sys.setrecursionlimit(1000000)
#endregion

# _INPUT = """# paste here...
# """
# sys.stdin = io.StringIO(_INPUT)

MOD = 1000000007

def main():
    P, K = map(int, input().split())

    dp0 = [0 for _ in range(K+1)]
    dp1 = [0 for _ in range(K+1)]
    dp0[0] = 1
    dp1[0] = 0
    for i in range(K):
        dp0[i+1] = (dp0[i] * (P+1) + dp1[i] * 2) % MOD
        dp1[i+1] = (dp0[i] * (P-1) + dp1[i] * (2*(P-1))) % MOD

    print(dp0[K])

if __name__ == '__main__':
    main()