fun main() {
    val builder = StringBuilder()

    // modきらい
    // ほかの解答コード写経したけど何をしているのか全然わからない……
    val mod = 1000000007L

    val (b, c, d) = readInputLine().split(" ").map { it.toLong() }

    if (c == 1L) {
        builder.appendln((b % mod) * (d % mod) % mod)
    } else {
        val t1 = (b % mod) * (c % mod) % mod
        val t2 = (mod - t1) * pow((c - 1L) % mod, mod - 2L, mod) % mod
        val ans = ((t1 - t2 + mod) % mod * pow(c % mod, d - 1L, mod) % mod + t2) % mod
        builder.appendln(ans)
    }

    print(builder.toString())
}

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

fun pow(x: Long, n: Long, mod: Long): Long {
    var ret = 1L
    var base = x
    var nTmp = n

    while (nTmp != 0L) {
        if (nTmp % 2L != 0L) {
            ret = ret * base % mod
        }
        base = base * base % mod
        nTmp /= 2L
    }

    return ret
}