fun main() {
    val builder = StringBuilder()

    val mod = 1000000007L

    val n = readInputLine().toInt()

    val dp = Array(n) { LongArray(10) }

    for (i in 0..9) {
        dp[0][i] = 1L
    }

    for (i in 1 until n) {
        var current = 0L
        for (j in 0..9) {
            current += dp[i - 1][j]
            dp[i][j] = current % mod
        }
    }

    builder.appendln(dp[n - 1].sum() % mod)

    print(builder.toString())
}

fun readInputLine(): String {
    return readLine()!!
}