n = int(input())
m = int(input())
MOD = 10**9
choose = [[0]*(m+1) for _ in range(m+1)]
choose[0][0] = 1
for i in range(1,m+1):
    for j in range(m+1):
        choose[i][j] = (choose[i-1][j] + choose[i-1][j-1])%MOD
print(choose[m][n//1000%m])