#include<bits/stdc++.h> using namespace std; int main() { int n,shu1,shu2,shu3,jg1,jg2,jg3,a,b,c,min; cin>>n>>shu1>>jg1>>shu2>>jg2>>shu3>>jg3; a=ceil(n*1.0/shu1)*jg1; b=ceil(n*1.0/shu2)*jg2; c=ceil(n*1.0/shu3)*jg3; min=a; if(b<min) { min=b; } if(c<min) { min=c; } cout<<min; return 0; }