Problem:
Score : 600 points

Problem Statement

The squirrel Chokudai has N acorns.
One day, he decides to do some trades in multiple precious metal exchanges to make more acorns.

His plan is as follows:

Get out of the nest with N acorns in his hands.

Go to Exchange A and do some trades.

Go to Exchange B and do some trades.

Go to Exchange A and do some trades.

Go back to the nest.

In Exchange X (X = A, B), he can perform the following operations any integer number of times (possibly zero) in any order:

Lose g_{X} acorns and gain 1 gram of gold.

Gain g_{X} acorns and lose 1 gram of gold.

Lose s_{X} acorns and gain 1 gram of silver.

Gain s_{X} acorns and lose 1 gram of silver.

Lose b_{X} acorns and gain 1 gram of bronze.

Gain b_{X} acorns and lose 1 gram of bronze.

Naturally, he cannot perform an operation that would leave him with a negative amount of acorns, gold, silver, or bronze.

What is the maximum number of acorns that he can bring to the nest?
Note that gold, silver, or bronze brought to the nest would be worthless because he is just a squirrel.

Constraints

1 \leq N \leq 5000

1 \leq g_{X} \leq 5000

1 \leq s_{X} \leq 5000

1 \leq b_{X} \leq 5000

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
g_A s_A b_A
g_B s_B b_B

Output

Print the maximum number of acorns that Chokudai can bring to the nest.

Sample Input 1

23
1 1 1
2 1 1

Sample Output 1

46

He can bring 46 acorns to the nest, as follows:

In Exchange A, trade 23 acorns for 23 grams of gold. {acorns, gold, silver, bronze}={ 0,23,0,0 }

In Exchange B, trade 23 grams of gold for 46 acorns. {acorns, gold, silver, bronze}={ 46,0,0,0 }

In Exchange A, trade nothing. {acorns, gold, silver, bronze}={ 46,0,0,0 }

He cannot have 47 or more acorns, so the answer is 46.

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector,fast-math")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma comment(linker, "/stack:200000000")

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<ld,ld> pdd;

#define X first
#define Y second

//#include <boost/unordered_map.hpp>
//using namespace boost;

/*
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> rbtree;
rbtree T;
*/

namespace io{
	const int L = (1 << 20) + 1;

	char buf[L], *S , *T, c;

	char getchar() {
		if(__builtin_expect(S == T, 0)) {
			T = (S = buf) + fread(buf, 1, L, stdin);
			return (S == T ? EOF : *S++);
		}
		return *S++;
	}

	int inp() {
		int x = 0, f = 1; char ch;
		for(ch = getchar(); !isdigit(ch); ch = getchar())
			if(ch == '-') f = -1;
		for(; isdigit(ch); x = x * 10 + ch - '0', ch = getchar());
		return x * f;
	}

	unsigned inpu()
	{
		unsigned x = 0; char ch;
		for(ch = getchar(); !isdigit(ch); ch = getchar());
		for(; isdigit(ch); x = x * 10 + ch - '0', ch = getchar());
		return x;
	}

	ll inp_ll() {
		ll x = 0; int f = 1; char ch;
		for(ch = getchar(); !isdigit(ch); ch = getchar())
			if(ch == '-') f = -1;
		for(; isdigit(ch); x = x * 10 + ch - '0', ch = getchar());
		return x * f;
	}

	char B[45], *outs=B+40, *outr=B+40;
	template<class T>
	inline void print(register T a,register char x=0){
		if(x) *--outs = x, x = 0;

		if(!a)*--outs = '0';
		else
			while(a)
				*--outs = (a % 10) + 48, a /= 10;

		if(x)
			*--outs = x;

		fwrite(outs, outr - outs , 1, stdout);
		outs = outr;
	}
};

using io :: print;
using io :: inp;
using io :: inpu;
using io :: inp_ll;

using i32 = int;
using i64 = long long;
using u8 = unsigned char;
using u32 = unsigned;
using u64 = unsigned long long;
using f64 = double;
using f80 = long double;
//using i128 = __int128_t;
//using u128 = __uint128_t;
using i128 = i64;
using u128 = u64;

ll power(ll a, ll b, ll p)
{
	if (!b) return 1;
	ll t = power(a, b/2, p);
	t = t*t%p;
	if (b&1) t = t*a%p;
	return t;
}

ll exgcd(ll a, ll b, ll &x, ll &y)
{
	if (b == 0)
	{
		x = 1;
		y = 0;
		return a;
	}
	ll px, py;
	ll d = exgcd(b, a%b, px, py);
	x = py;
	y = px-a/b*py;
	return d;
}

template<class T>
inline void freshmin(T &a, const T &b)
{
	if (a > b) a = b;
}

template<class T>
inline void freshmax(T &a, const T &b)
{
	if (a < b) a = b;
}

const int MOD = 1000000007;
const int INF = 1000000000;
const int MAXN = 5010;
const int MAXK = 20;

int main()
{
	
	ll n, a[3], b[3];
	cin >> n >> a[0] >> a[1] >> a[2] >> b[0] >> b[1] >> b[2];
	
	ll m = n;
	for (ll x0 = 0; x0 <= n/a[0]; ++ x0)
		for (ll x1 = 0; x1 <= (n-x0*a[0])/a[1]; ++ x1)
		{
			ll remain = n-x0*a[0]-x1*a[1];
			if (a[2] < b[2])
				m = max(m, x0*b[0]+x1*b[1]+remain/a[2]*b[2]+remain%a[2]);
			else
				m = max(m, x0*b[0]+x1*b[1]+remain);
		}
	
	if (n == m)
	{
		swap(a[0], b[0]); swap(a[1], b[1]); swap(a[2], b[2]);
		for (ll x0 = 0; x0 <= n/a[0]; ++ x0)
			for (ll x1 = 0; x1 <= (n-x0*a[0])/a[1]; ++ x1)
			{
				ll remain = n-x0*a[0]-x1*a[1];
				if (a[2] < b[2])
					m = max(m, x0*b[0]+x1*b[1]+remain/a[2]*b[2]+remain%a[2]);
				else
					m = max(m, x0*b[0]+x1*b[1]+remain);
			}
	}
	else
	{
		n = m;
		swap(a[0], b[0]); swap(a[1], b[1]); swap(a[2], b[2]);
		if (a[0] >= b[0])
		{
			swap(a[0], a[2]);
			swap(b[0], b[2]);
		}
		if (a[1] >= b[1])
		{
			swap(a[1], a[2]);
			swap(b[1], b[2]);
		}
		for (ll x0 = 0; x0 <= n/a[0]; ++ x0)
		{
			ll remain = n-x0*a[0];
			if (a[1] < b[1])
				m = max(m, x0*b[0]+remain/a[1]*b[1]+remain%a[1]);
			else
				m = max(m, x0*b[0]+remain);
		}
	}
	
	cout << m << endl;
	
	return 0;
}