#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

const int MOD = 1e9 + 7;

ll pow(ll a, ll b, int m) {
    ll ans = 1;
    while (b) {
        if (b % 2 == 1)
            ans = (ans * a) % m;
        b /= 2;
        a = (a * a) % m;
    }
    return ans;
}

int main() {
    ll A, B, C, K;
    cin >> A >> B >> C >> K;

    int r = pow(2, K, MOD - 1);

    ll ans = pow(A * B % MOD * C % MOD, r, MOD);

    cout << ans << endl;

    return 0;
}