啊啊啊！大佬救救孩子吧!

#include <bits/stdc++.h>
using namespace std ;

int n , a1 , a2 , b1 , b2 , c1 , c2 , minn = 10000 ;
double num ;

int main()
{
	cin >> n ;
	cin >> a1 >> a2 >> b1 >> b2 >> c1 >> c2 ;
	minn = ( ceil( n * 1.0 / a1 ) * a2 , ceil( n * 1.0 / b1 ) * b2 ) ; 
	minn = ( minn , ceil( n * 1.0 / c1 ) * c2 ) ;
	cout << minn ;
	return 0 ;
}