#############################################################

import sys
sys.setrecursionlimit(10**7)

from heapq import heappop,heappush
from collections import deque,defaultdict,Counter
from bisect import bisect_left, bisect_right
from itertools import product,combinations,permutations

ipt = sys.stdin.readline

def iin():
    return int(ipt())
def lmin():
    return list(map(int,ipt().split()))

MOD = 998244353
inf = 1<<60
#############################################################

M = 3000**2

N = iin()
A1,B1 = lmin()
A2,B2 = lmin()
A3,B3 = lmin()

if N < M:
    dp = [-inf]*(N+1)
    dp[0] = 0
    for i in range(1,N+1):
        if i >= A1:
            dp[i] = max(dp[i],dp[i-A1]+B1)
        if i >= A2:
            dp[i] = max(dp[i],dp[i-A2]+B2)
        if i >= A3:
            dp[i] = max(dp[i],dp[i-A3]+B3)
    print(max(dp))
else:
    L = N-M
    r = (L+A1-1)//A1
    t = r*A1
    
    dp = [-inf]*(M+1)
    dp[t-L] = B1*r

    r = (L+A2-1)//A2
    t = r*A2
    
    dp[t-L] = B2*r

    r = (L+A3-1)//A3
    t = r*A3

    dp[t-L] = B3*r

    for i in range(1,M+1):
        if i >= A1:
            dp[i] = max(dp[i],dp[i-A1]+B1)
        if i >= A2:
            dp[i] = max(dp[i],dp[i-A2]+B2)
        if i >= A3:
            dp[i] = max(dp[i],dp[i-A3]+B3)
    print(max(dp))