There is a building with n rooms, numbered 1 to n.

We can move from any room to any other room in the building.

Let us call the following event a move: a person in some room i goes to another room j~ (i \neq j).

Initially, there was one person in each room in the building.

After that, we know that there were exactly k moves happened up to now.

We are interested in the number of people in each of the n rooms now. How many combinations of numbers of people in the n rooms are possible?

Find the count modulo (10^9 + 7).

Constraints

* All values in input are integers.
* 3 \leq n \leq 2 \times 10^5
* 2 \leq k \leq 10^9

Input

Input is given from Standard Input in the following format:


n k


Output

Print the number of possible combinations of numbers of people in the n rooms now, modulo (10^9 + 7).

Examples

Input

3 2


Output

10


Input

200000 1000000000


Output

607923868


Input

15 6


Output

22583772
def cmb(n,r,mod):
  if r<0 or r>n:
    return 0
  r=min(r,n-r)
  return g1[n]*g2[r]*g2[n-r]%mod
 
n,k=map(int,input().split())
mod=10**9+7

g1=[1,1]
g2=[1,1]
inverse=[0,1]
 
for i in range(2,2*n+3):
  g1.append((g1[-1]*i)%mod)
  inverse.append((-inverse[mod%i]*(mod//i))%mod)
  g2.append((g2[-1]*inverse[-1])%mod)

if n<=k-1:
  print(cmb(2*n-1,n-1,mod))
else:
  ans=0
  for i in range(min(n,k+1)):
    ans+=cmb(n,i,mod)*cmb(n-(n-i)+n-i-1,n-i-1,mod)
    ans%=mod
  print(ans%mod)