#include<iostream>
using namespace std;
int main(){
	int a,b,c,d,e,f,k;
	cin>>a>>b>>c>>d>>e>>f>>k;
	int ans_1,ans_2;
	ans_1=k/b*a*c;
	ans_2=k/e*d*f;
	if(ans_1>ans_2) cout<<ans_1;
	else cout<<ans_2;
}

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