There are $2018$ boxes $C_1$, $C_2$, $C_3$,..,$C_{2018}$. The $n$-th box $C_n$ contains $n$ balls. A move consists of the following steps: a) Choose an integer $k$ greater than $1$ and choose $m$ a multiple of $k$. b) Take a ball from each of the consecutive boxes $C_{m-1}$, $C_m$, $C_{m+1}$ and move the $3$ balls to the box $C_{m+k}$. With these movements, what is the largest number of balls we can get in the box $2018$?