#include<stdio.h>
int main()
{
    int a,b,c,n,A,B,C,S1,S2,S3,S4,e;
    scanf("%d%d%d%d%d%d%d",&n,&a,&A,&b,&B,&c,&C);
    if(n%a==0)
    {S1=(n/a)*A;
	
    } 
	else if(n%a!=0)
	{S1=(n/a+1)*A;
	}
    if(n%b==0)
    {S2=n/b*B;
	}
	else if(n/b!=0)
	{S2==(n/b+1)*B;
	}
    if(n%c==0)
    {S3=n/c*C;
	}
	else if(n%c!=0)
	{S3=(n/c+1)*C;
	}
	if(S1<S2)
	{e=S1;                     
	}
	else
	e=S2;
	if(e>S3)
	{e=S3;
	}
   
	printf("%d",e);
	return 0;
}