import sys
input = sys.stdin.readline

N=int(input())
AB=[list(map(int,input().split())) for i in range(3)]

X=[AB[i][1]/AB[i][0] for i in range(3)]

MAX=max(X)
ind=X.index(MAX)

a,b=AB[ind]

k=max(0,N-10**7)//a

ANS=k*b
N-=k*a

ANS2=0
for i in range(N//AB[0][0]+1):
    rest=N-i*AB[0][0]

    for j in range(rest//AB[1][0]+1):

        rest2=rest-j*AB[1][0]

        ANS2=max(ANS2,i*AB[0][1]+j*AB[1][1]+(rest2//AB[2][0])*AB[2][1])

print(ANS+ANS2)