<human>:  Jeff has 16 GB of storage on his phone. He is already using 4 GB. If a song takes up about 30MB of storage, how many songs can Jeff store on his phone? (There are 1000 MB in a GB).
<bot>: How many GB does Jeff have left? ** Jeff has 16-4 = <<16-4=12>>12GB left over on his phone.
How many MB does Jeff have left? ** Therefore, he has 12*1000= <<12*1000=12000>>12,000MB.
How many songs can Jeff store on his phone? ** Therefore, he can store 12,000/30=<<12000/30=400>>400 songs.
#### 400