#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)
#define all(a) (a).begin(),(a).end()

#include <atcoder/modint>
using namespace atcoder;
using mint = modint1000000007;

ll modpow(ll a, ll n, ll m) {
    ll res = 1;
    while (n > 0) {
        if (n & 1) res = res * a % m;
        a = a * a % m;
        n >>= 1;
    }
    return res;
}

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    ll A, B, C, K;
    cin >> A >> B >> C >> K;
    
    mint ans = mint(A) * mint(B) * mint(C);
    ll d = modpow(2, K, 1000000006);
    ans = ans.pow(d);
    cout << ans.val() << '\n';
}