N = int(input())
A1,B1 = map(int,input().split())
A2,B2 = map(int,input().split())
A3,B3 = map(int,input().split())
ans = 0
if A2*B1>=A1*B2 and A3*B1>=A1*B3:
    for n2 in range(A1+1):
        for n3 in range(A1+1):
            if n2*A2+n3*A3>N:continue
            n1 = (N-n2*A2-n3*A3)//A1
            ans = max(ans,n1*B1+n2*B2+n3*B3)
elif A1*B2>=A2*B1 and A3*B2>=A2*B3:
    for n1 in range(A2+1):
        for n3 in range(A2+1):
            if n1*A1+n3*A3>N:continue
            n2 = (N-n1*A1-n3*A3)//A2
            ans = max(ans,n1*B1+n2*B2+n3*B3)
else:
    for n1 in range(A3+1):
        for n2 in range(A3+1):
            if n1*A1+n2*A2>N:continue
            n3 = (N-n1*A1-n2*A2)//A3
            ans = max(ans,n1*B1+n2*B2+n3*B3)
print(ans)