暴力代码

#include<iostream>
using namespace std;
int main(){
	int n,a,b,s1=0,s2=0,s3=0,m=0;
	cin>>n;
	cin>>a>>b;
	s1=n/a*b;
	if(s1<n){//如果要超购
		s1+=b;
	}
	cin>>a>>b;
	s2=n/a*b;
	if(s2<n){
		s2+=b;
	}
	cin>>a>>b;
	s3=n/a*b;
	if(s3<n){
		s3+=b;
	}
	m=min(min(s1,s2),s3);
	cout<<m;     
}