75

#include<bits/stdc++.h>
using namespace std;
int main()
{
	long long ve,vm,vt,e,m,t,vee,vmm,vta;
	cin>>ve>>vm>>vt>>e>>m>>t;
	vee=ve*e;
	vmm=vm*m;
	int veeg=vee+vmm;
	if(veeg%vt!=0)vta=veeg/vt+1;
	if(veeg%vt==0)vta=veeg/vt;
	if(vta%t==0)cout<<vta/t;
	if(vta%t!=0)cout<<vta/t+1;
	return 0;
}