```cpp
#include<bits/stdc++.h>
using namespace std;
const long long MAXN=10000000000000;
int main()
{
long long n,m=MAXN,k;
cin>>n;
int a[4],b[4];
for(int i=1;i<=3;i++)
cin>>a[i]>>b[i];
for(int j=1;j<=3;j++)
{
if(n%a[j]==0) k=n/a[j]*b[j];
if(n%a[j]!=0) k=(n/a[j]+1)*b[j];
if(k<m)
{
m=k;
}
}
cout<<m<<endl;
return 0;
}
```
by 冲上云霄 @ 2017-10-29 22:46:39