N = int(input())
M = int(input())
MOD = 10**9

def pascal_triangle(n, r):
    tr = [[1]]
    for d in range(1, n+1):
        row = [1] * (d+1)
        for i in range(1, d):
            row[i] = tr[d-1][i-1] + tr[d-1][i]
            row[i] %= MOD
        tr.append(row)
    return tr[n][r]

x = N - ((N // 1000) // M) * 1000 * M
r = x // 1000
ans = pascal_triangle(M, r)
print(ans)