#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main(){
	
	long long a,b,c,k;
	cin>>a>>b>>c>>k;
	
	mint ans = a;
	ans *= b;
	ans *= c;
	
	ans = mint(ans).pow(pow_mod(2,k,1000000006));
	
	cout<<ans.val()<<endl;
	
    return 0;
}