\problemname{Workout for a Dumbbell}
Jim Ratt has just joined a local fitness center.  He's especially excited
about a sequence of $10$ machines that he cycles through three times for his
workout.  He has a fixed time which he spends on each machine, as well as
a fixed recovery time after using a machine.  Jim's not the brightest guy in
the world, but in the absence of anything else
even he would easily be able to calculate how long his workout would take.

But of course, Jim isn't the only person who uses the fitness center and
wouldn't you know it but when Jim shows up there are always $10$ other people
there, each using one of the ten machines exclusively.  Like Jim, each person
has a fixed time they use on their machine as well as a fixed recovery time.
This will sometimes cause Jim to have to wait for a particular machine, and
Jim's usage sometimes results in the other people having to wait as well
(though if both Jim and another person want to start using a machine at the same
 time, Jim is polite enough to let the other person go first).
Jim has gone to the center often enough that he has a good idea what everyone's
usage and recovery times are, but he has trouble determining how
long it will take him to perform his workout.  That's where you are going to
flex your programming muscles.

\section*{Input}
Input starts with a line containing twenty integers; the first two give Jim's
usage and recovery time for machine $1$, the next two give Jim's usage and
recovery time for machine $2$, etc.  The next line contains $3$ integers $u$ $r$
$t$; the first two values are the usage and recovery times for the person who is
using machine $1$, and $t$ is the time when he/she first starts using the machine.
The next $9$ lines specify similar information for machines $2$ through $10$. All
usage and recovery times are positive and $\leq 5\,000\,000$ and all start times
$t$ satisfy $|t| \leq 5\,000\,000$. You should assume that Jim is ready to use
machine $1$ at time $0$.

\section*{Output}
Display the time when Jim has finished his workout, i.e., the moment when
he has finished his usage time on machine $10$ for the third time (don't count
the last recovery time for that machine).
