#include <bits/stdc++.h>

using std::cin;
using std::cout;
using std::istream;
using std::ostream;
using ll = long long;

// const int mod = 998244353;
const int mod = 1000000007;

ll qmi(ll m, ll k, ll p)
{
    ll res = 1 % p, t = m;
    while (k)
    {
        if (k&1) res = res * t % p;
        t = t * t % p;
        k >>= 1;
    }
    return res;
}

int main() {
	ll a, b, c, k;
	cin >> a >> b >> c >> k;
	
	ll ok = 0;
	if (k >= 31) ok = mod - 1;
	k = qmi(2, k, mod - 1) + ok;
	ll ans = qmi(a, k, mod) % mod * qmi(b, k, mod) % mod * qmi(c, k, mod) % mod;
	cout << ans << '\n';
	
	return 0;
}