import sys
import math
from collections import deque,Counter
sys.setrecursionlimit(10**7)
int1=lambda x: int(x)-1

mi=lambda :map(int,input().split())
li=lambda :list(mi())
mi1=lambda :map(int1,input().split())
li1=lambda :list(mi1())
mis=lambda :map(str,input().split())
lis=lambda :list(mis())

mod=10**9+7
Mod=998244353
INF=10**18
ans=0

a,b,c=mi()
k=int(input())
n=pow(2,k,mod-1)
print(pow(a*b*c,n,mod))