#include <iostream>
#include <cstring>
#include <algorithm>
#define ll long long

using namespace std;

const ll mod1=1e9+7;
const ll mod2=1e9+6;

ll POW(ll x,ll y,ll mod){
    ll sum=1;
    while(y){
        if(y&1) sum=((sum%mod)*(x%mod))%mod;
        x=((x%mod)*(x%mod))%mod;
        y>>=1;
    }
    return sum;
}

int main(){
    ios::sync_with_stdio(false);
    ll a,b,c;
    cin>>a>>b>>c;
    ll k;cin>>k;
    ll ans=1;
    
    k=POW(2,k,mod2);
    
    ans*=POW(a,k,mod1);
    ans%=mod1;
    ans*=POW(b,k,mod1);
    ans%=mod1;
    ans*=POW(c,k,mod1);
    ans%=mod1;
    cout<<ans<<endl;
    return 0;
}