#include<bits/stdc++.h> using namespace std; int n,ans,ans1; int main(){ cin>>n; for(int i=1;i<=3;i++){ int x,y; cin>>x>>y; if(n%x==0){ ans=n/x*y; } else{ ans=n/x*y+y; } ans1=ans; if(ans<ans1){ ans=ans1; } } cout<<ans; return 0; }