N = int(input())
M = int(input())
a = N//1000//M
b = N - (a * M) * 1000
c = b//1000
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(pascal2(M, c)%1000000000)