from collections import *
from itertools import *
from functools import *
import math,sys
input = sys.stdin.readline

mod = 10**9 + 7
N,M = map(int,input().split())
ans = 1
for i in range(N+1):
    ans *= M+1-i
    ans %= mod
    ans *= pow(N+1-i,mod-2,mod)
    ans %= mod
print(ans)