```
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n, ni,pi,minp=INT_MAX,curp,i=1;
cin>>n;
while(i<=3)
{
cin>>ni>>pi;
curp=(n+ni-1)/ni*pi;
if(curp<minp)
{
minp=curp;
}
i++;
}
cout<<minp;
return 0;
}
```
by wuzehui123456 @ 2023-02-12 15:46:58