```cpp
#include<bits/stdc++.h>
using namespace std;
int n,x,y,s,minx=99999999;
int main()
{
scanf("%d",&n);
{
for(int i=1;i<=3;i++)
{
scanf("%d%d",&x,&y);
s=(n/x+(n%x!=0))*y;
if(s<minx)
{
minx=s;
}
}
}
printf("%d\n",minx);
return 0;
}
```
by ZYXZYX20110608 @ 2021-11-03 21:54:20