fun main() {
    val builder = StringBuilder()

    val mod = 1000000007L

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

    if (c == 1L) {
        builder.appendln(b * d % mod)
    } else {
        val numerator = (pow(c % mod, d + 1L, mod) + mod - 1L) % mod
        val denominator = modInv((c - 1L) % mod, mod) % mod
        builder.appendln(((b % mod * numerator % mod * denominator % mod) + mod - (b % mod)) % mod)
    }

    print(builder.toString())
}

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

// a^-1 mod mod
fun modInv(a: Long, mod: Long): Long {
    var aLoc = a
    var b = mod
    var u = 1L
    var v = 0L
    while (b != 0L) {
        val t = aLoc / b
        aLoc -= t * b

        val swapTmpB = b
        b = aLoc
        aLoc = swapTmpB

        u -= t * v

        val swapTmpU = u
        u = v
        v = swapTmpU
    }

    u %= mod
    if (u < 0) {
        u += mod
    }
    return u
}

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
}