import sys
from collections import deque, Counter
from math import gcd, log10, pi, sqrt, ceil
from bisect import bisect, bisect_left, bisect_right, insort
from typing import Iterable, TypeVar, Union, Tuple, Iterator, List
# import bisect
import copy
import heapq
import itertools
import math
import random
from fractions import Fraction
from functools import lru_cache, partial, cmp_to_key
import operator
# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')
# import string
# import networkx as nx
input = sys.stdin.readline
sys.setrecursionlimit(10000000)
# mod = 10 ** 9 + 7
mod = 998244353
# mod = 1 << 128
# mod = 10 ** 30 + 1
INF = 1 << 61
DIFF = 10 ** -9
DX = [1, 0, -1, 0, 1, 1, -1, -1]
DY = [0, 1, 0, -1, 1, -1, 1, -1]

def read_values(): return tuple(map(int, input().split()))
def read_index(): return tuple(map(lambda x: int(x) - 1, input().split()))
def read_list(): return list(read_values())
def read_lists(N): return [read_list() for _ in range(N)]


def main():
    N = int(input())
    S = read_lists(3)
    S += S
    A = max(a for a, _ in S)

    res = 0
    for k in range(3):
        A1, B1 = S[k]
        A2, B2 = S[k + 1]
        A3, B3 = S[k + 2]

        for i in range(A + 10):
            N1 = N - A1 * i
            if N1 < 0:
                break
            r1 = i * B1

            for j in range(A + 10):
                N2 = N1 - A2 * j
                if N2 < 0:
                    break
                
                res = max(res, r1 + j * B2 + (N2 // A3) * B3)
    print(res)


if __name__ == "__main__":
    main()