#include <bits/stdc++.h>
using namespace std;

long long a, b, c, k;
const long long M = 1e9 + 7;

long long powm(long long a, long long b, long long m) {
	long long u = 1, v = a;

	while (b > 0) {
		if (b & 1)
			u = u * v % m;

		b >>= 1;
		v = v * v % m;
	}

	return u;
}

int main()
{
	cin >> a >> b >> c >> k;
	a = a % M * (b % M) % M * (c % M) % M;
	cout << powm(a, powm(2, k, M - 1), M) << endl;
}