N = int(input())
M = int(input())
MOD = 10**9
N = N//1000
r = N%M
dp = [[0 for _ in range(r+1)] for _ in range(2)]
dp[0][0] = 1
dp[1][0] = 1
for i in range(1,M+1):
    for j in range(1,r+1):
        if j>i:break
        dp[i%2][j] = (dp[(i-1)%2][j]+dp[(i-1)%2][j-1])%MOD
print(dp[M%2][r])