Line Plots · Easy problem

A line plot shows the number of push-ups some kids did. Above $12$ there is $1$ X, above $13$ there are none, above $14$ there are $3$ X's, above $15$ there are $2$ X's, above $16$ there are $4$ X's, and above $17$ there is $1$ X. What is the range of the data (the greatest value minus the least value)?