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)]

ANS=0

MIN=0
MAX=N//AB[0][0]

while MAX-MIN>5:
    mid1=MIN+(MAX-MIN)//3
    mid2=MIN+(MAX-MIN)//3*2
    
    rest=N-mid1*AB[0][0]
    MIN2=0
    MAX2=rest//AB[1][0]

    while MAX2-MIN2>5:
        mid01=MIN2+(MAX2-MIN2)//3
        mid02=MIN2+(MAX2-MIN2)//3*2

        rest2=rest-mid01*AB[1][0]
        c1=mid1*AB[0][1]+mid01*AB[1][1]+(rest2//AB[2][0])*AB[2][1]

        rest2=rest-mid02*AB[1][0]
        c2=mid1*AB[0][1]+mid02*AB[1][1]+(rest2//AB[2][0])*AB[2][1]

        if c1>c2:
            MAX2=mid02
        else:
            MIN2=mid01

    A1=0

    for j in range(MIN2,MAX2+1):
        rest2=rest-j*AB[1][0]
        A1=max(A1,mid1*AB[0][1]+j*AB[1][1]+(rest2//AB[2][0])*AB[2][1])

    rest=N-mid2*AB[0][0]
    MIN2=0
    MAX2=rest//AB[1][0]

    while MAX2-MIN2>5:
        mid01=MIN2+(MAX2-MIN2)//3
        mid02=MIN2+(MAX2-MIN2)//3*2

        rest2=rest-mid01*AB[1][0]
        c1=mid2*AB[0][1]+mid01*AB[1][1]+(rest2//AB[2][0])*AB[2][1]

        rest2=rest-mid02*AB[1][0]
        c2=mid2*AB[0][1]+mid02*AB[1][1]+(rest2//AB[2][0])*AB[2][1]

        if c1>c2:
            MAX2=mid02
        else:
            MIN2=mid01

    A2=0

    for j in range(MIN2,MAX2+1):
        rest2=rest-j*AB[1][0]
        A2=max(A2,mid2*AB[0][1]+j*AB[1][1]+(rest2//AB[2][0])*AB[2][1])

    if A1>A2:
        MAX=mid2
    else:
        MIN=mid1

ANS=0

for mid in range(MIN,MAX+1):
    rest=N-mid*AB[0][0]
    MIN2=0
    MAX2=rest//AB[1][0]

    while MAX2-MIN2>5:
        mid01=MIN2+(MAX2-MIN2)//3
        mid02=MIN2+(MAX2-MIN2)//3*2

        rest2=rest-mid01*AB[1][0]
        c1=mid*AB[0][1]+mid01*AB[1][1]+(rest2//AB[2][0])*AB[2][1]

        rest2=rest-mid02*AB[1][0]
        c2=mid*AB[0][1]+mid02*AB[1][1]+(rest2//AB[2][0])*AB[2][1]

        if c1>c2:
            MAX2=mid02
        else:
            MIN2=mid01

    for j in range(MIN2,MAX2+1):
        rest2=rest-j*AB[1][0]
        ANS=max(ANS,mid*AB[0][1]+j*AB[1][1]+(rest2//AB[2][0])*AB[2][1])
    

        

print(ANS)