#include<bits/stdc++.h> using namespace std; int main() { int n,a,b,i,j,k,min=999999999; cin>>n; for(i=1;i<=3;i++){ cin>>a>>b; for(j=1;;j++){ if(a*j>=n){ k=b*j; break; } else continue; } if(k<=min)min=k; } cout<<min<<endl; }