N = int(input())
M = int(input())
a = N//1000//M
b = N - (a * M) * 1000
c = b//1000
# d = (N - ((N//1000//M) * M) * 1000) //1000

def perm(n, k):
    result = 1
    for i in range(1, k + 1):
        result *= (n - i + 1)
        result //= i
    return result

def pascal(n, k):
    z = n+1
    p = [[0 for _ in range(z)] for _ in range(z)]
    p[0][0] = 1
    for x in range(1, z):
        for y in range(0, z):
            p[x][y] = (p[x-1][y-1] + p[x-1][y])%1000000000
    return p[n][k]

def pascal2(n, k):
    p = [0 for _ in range(n+1)]
    p[0] = 1
    for x in range(1, n+1):
        for y in range(n, 0, -1):
            p[y] = (p[y-1] + p[y])%1000000000
    return p[k]


# print(pascal(M, c))
# print(M, c)
# print(perm(M, c)%1000000000)
# print(pascal(M, c)%1000000000)
print(pascal2(M, c)%1000000000)