#include<cstdio>
inline int readint()
{
    int i=0;
    char ch;
    for(ch=getchar();ch<'0'||ch>'9';ch=getchar());
    for(;ch>='0' && ch<='9';ch=getchar())
        i=(i<<3)+(i<<1)+ch-'0';
    return i;
}
int main()
{
	int n,a,b,ans=1e7;
	n=readint();
	for(int i=0;i<=2;++i)
	{
		a=readint();
		b=readint();
		n%a ? a=n/a+1 : a=n/a;
		a*b<ans ? ans=a*b : false;
	}
	printf("%d",ans);
	return 0;
}