#include<iostream>
using namespace std;
int N,M;
long K,p,q,ba,bb,mod=1e9+7;
long power(long a,long b){return b?power(a*a%mod,b/2)*(b%2?a:1)%mod:1;}
main()
{
	cin>>N>>M>>K>>p>>q;
	for(int i=0;i<N;i++)
	{
		long b;cin>>b;
		if(i<M)ba+=b;
		else bb+=b;
	}
	ba%=mod;
	bb%=mod;
	p=p*power(q,mod-2)%mod*2%mod;
	p=(1-p+mod)%mod;
	p=power(p,K);
	cout<<(ba*(1+p)%mod+bb*(1+mod-p)%mod)%mod*power(2,mod-2)%mod<<endl;
}