package main

import (
    "fmt"
)


func pascal( n, m , mod int32) int32 {
    n += 1
    var p [10001][10001]int32
    p[0][0] = 1
    var i, j int32
    for i=1; i<n; i++ {
        for j=0; j<n; j++ {
//            fmt.Println(i,j)
//            fmt.Println(p[i][j])
//            fmt.Println(p[i-1][j-1])
//            fmt.Println(p[i-1][j-1])
            if j == 0 {
                p[i][j] = 1
            } else {
                p[i][j] = (p[i-1][j-1]+p[i-1][j])%mod
            }
        }
    }
    return p[n-1][m]
}

func main() {
    var mod int32
    mod = 1000000000
    var N, M int32
    fmt.Scan(&N)
    fmt.Scan(&M)
    var a, b, c int32
    a = N/1000/M
    b = N - (a * M) * 1000
    c = b/1000
    N /= 1000
    N %= M
//    fmt.Println(M, c)
    fmt.Println(pascal(M, c, mod)%mod)
}