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

for i in range(M+1):
    next_dp = [0] * (i + 1)
    for j in range(i+1):
        if j in [0, i]:
            next_dp[j] = 1
        else:
            next_dp[j] = (dp[j-1] + dp[j]) % MOD
    dp = next_dp
            
i = N // (M * 1000)
c = (N - M * 1000 * i) // 1000
ans = dp[c]
print(ans)