模拟即可

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,minn=1e9;
	cin >> n;
	for(int i = 1;i<=3;i++)
	{
		int x,y;
		cin >> x >> y;
		int b=n/x*y,c=n%x;
		if(c>0) b+=y;
		minn=min(minn,b);
	}
	cout << minn;
	return 0;
}

```
`