#include #include #include <math.h> using namespace std; int main ()

{long n,s,min=100000000,c[4],p[4],i;

cin>>n; for (i=1;i<=3;i++) { cin>>c[i]>>p[i]; if (n%c[i]==0) s=n/c[i]*p[i]; else s=(n/c[i]+1)*p[i];

if(s<min) min=s;

} cout<<min;}

不用脑子写法

include <iostream>
using namespace std;
int main()
{
	int n;
	int a1,a2,b1,b2,c1,c2;
	cin>>n;
	cin>>a1>>a2>>b1>>b2>>c1>>c2;
	int s1=0,s2=0,s3=0;
	if(n%a1==0)
	s1=n/a1*a2;
	else
	s1=(n/a1+1)*a2;
	
	
	if(n%b1==0)
	s2=n/b1*b2;
	else
	s2=(n/b1+1)*b2;
	
	
	if(n%c1==0)
	s3=n/c1*c2;
	else
	s3=(n/c1+1)*c2;
	
	int min=s1;
	if(s2<=min)
	min=s2;
	if(s3<=min)
	min=s3;
	cout<<min;
	return 0;
	
}