#include #include #include <math.h> using namespace std; int main ()

{long n,s,min=100000000,c[4],p[4],i;

cin>>n; for (i=1;i<=3;i++) { cin>>c[i]>>p[i]; if (n%c[i]==0) s=n/c[i]*p[i]; else s=(n/c[i]+1)*p[i];

if(s<min) min=s;

} cout<<min;}