def check(x1000, x100, x1, d, d1000, d100, d1):
    m = d // 1000
    if m <= x1000:
        d %= 1000
        x1000 -= m
    else:
        d -= x1000 * 1000
        x1000 = 0
    m = d // 100
    if m <= x100:
        d %= 100
        x100 -= m
    else:
        d -= x100 * 100
        x100 = 0
    if d <= x1:
        x1 -= d
        x1000 += d1000
        x100 += d100
        x1 += d1
        return True, x1000, x100, x1
    return False, -1, -1, -1

A1000,A100,A1 = map(int,input().split())
Db = int(input())
B1000,B100,B1 = map(int,input().split())
Dc = int(input())
C1000,C100,C1 = map(int,input().split())
DP = [[-1] * 101 for _ in range(11)]
DP[A1000][A100] = A1
ans = 0
for cnt in range(1,10001):
    DP2 = [[-1] * 101 for _ in range(11)]
    for i in range(11):
        for j in range(101):
            if DP[i][j] == -1:
                continue
            flg,x1000,x100,x1 = check(i, j, DP[i][j], Db, B1000, B100, B1)
            if flg:
                DP2[x1000][x100] = x1
                ans = cnt
            flg,x1000,x100,x1 = check(i, j, DP[i][j], Dc, C1000, C100, C1)
            if flg:
                DP2[x1000][x100] = x1
                ans = cnt
    DP = DP2
print(ans)