package main

import (
	"fmt"
)

const MOD = 1000000007

func modpow(a int, n int, mod int) int {
	m := 1
	for n > 0 {
		if n&1 == 1 {
			m = (m * a) % mod
		}
		a = (a * a) % mod
		n >>= 1
	}
	return m
}

func main() {
	var A, B, C, K int
	fmt.Scan(&A, &B, &C)
	fmt.Scan(&K)

	ABC := (A * B % MOD) * C % MOD
	fmt.Println(modpow(ABC, modpow(2, K, MOD-1), MOD))
}