n,k = map(int,input().split())

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

mod = 10**9+7 #出力の制限
g1 = [1, 1] # 元テーブル
g2 = [1, 1] #逆元テーブル
inverse = [0, 1] #逆元テーブル計算用テーブル

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

ans = 0
#con = cmb(n,k,mod)
#print(con)
for i in range(min(k+1,n+1)):
    ans += cmb(n,i,mod)*cmb(n-1,i,mod)
    ans %= mod
    
print(ans) n,k = map(int,input().split()) n map(int,input().split()) map int input().split() ().split () input split k 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 cmb if ( r<0 or r>n ):
        return 0
     r<0 or r>n r<0 r 0 r>n r n return 0 0 r = min(r, n-r) r min(r, n-r) min r n-r n r return g1[n] * g2[r] * g2[n-r] % mod g1[n] * g2[r] * g2[n-r] % mod g1[n] * g2[r] * g2[n-r] g1[n] * g2[r] g1[n] g1 n g2[r] g2 r g2[n-r] g2 n-r n r mod n n r r mod mod mod = 10**9+7 mod 10**9+7 10**9 10 9 7 g1 = [1, 1] g1 [1, 1] 1 1 g2 = [1, 1] g2 [1, 1] 1 1 inverse = [0, 1] inverse [0, 1] 0 1 for i in range( 2, n + 1 ):
    g1.append( ( g1[-1] * i ) % mod )
    inverse.append( ( -inverse[mod % i] * (mod//i) ) % mod )
    g2.append( (g2[-1] * inverse[-1]) % mod ) i range( 2, n + 1 ) range 2 n + 1 n 1 g1.append( ( g1[-1] * i ) % mod ) g1.append g1 append ( g1[-1] * i ) % mod g1[-1] * i g1[-1] g1 -1 i mod inverse.append( ( -inverse[mod % i] * (mod//i) ) % mod ) inverse.append inverse append ( -inverse[mod % i] * (mod//i) ) % mod -inverse[mod % i] * (mod//i) -inverse[mod % i] inverse[mod % i] inverse mod % i mod i mod//i mod i mod g2.append( (g2[-1] * inverse[-1]) % mod ) g2.append g2 append (g2[-1] * inverse[-1]) % mod g2[-1] * inverse[-1] g2[-1] g2 -1 inverse[-1] inverse -1 mod ans = 0 ans 0 for i in range(min(k+1,n+1)):
    ans += cmb(n,i,mod)*cmb(n-1,i,mod)
    ans %= mod
     i range(min(k+1,n+1)) range min(k+1,n+1) min k+1 k 1 n+1 n 1 ans += cmb(n,i,mod)*cmb(n-1,i,mod) ans cmb(n,i,mod)*cmb(n-1,i,mod) cmb(n,i,mod) cmb n i mod cmb(n-1,i,mod) cmb n-1 n 1 i mod ans %= mod ans mod print(ans) print ans inverse = [0, 1] [0, 1] inverse ans = 0 0 ans 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 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 cmb k = map(int,input().split()) map(int,input().split()) k g2 = [1, 1] [1, 1] g2 ans %= mod mod ans n,k = map(int,input().split()) map(int,input().split()) n mod = 10**9+7 10**9+7 mod ans += cmb(n,i,mod)*cmb(n-1,i,mod) cmb(n,i,mod)*cmb(n-1,i,mod) ans g1 = [1, 1] [1, 1] g1
n,k = map(int,input().split())

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

mod = 10**9+7 #出力の制限
g1 = [1, 1] # 元テーブル
g2 = [1, 1] #逆元テーブル
inverse = [0, 1] #逆元テーブル計算用テーブル

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

ans = 0
#con = cmb(n,k,mod)
#print(con)
for i in range(min(k+1,n+1)):
    ans += cmb(n,i,mod)*cmb(n-1,i,mod)
    ans %= mod
    
print(ans)