write a code in any language

You have n coins and you want to build a staircase with these coins. The staircase consists of k rows where the ith row has exactly i coins. The last row of the staircase may be incomplete.

Given the integer n$,$ return the number of complete rows of the staircase you will build.

$$

Example $1$:

Input: n $=5$ Output: $2$ Explanation: Because the $3$rd row is incomplete, we return $2.$

Example $2$:

Input: n $=8$ Output: $3$ Explanation: Because the $4$th row is incomplete, we return $3.$

$$

Constraints:

n

Example $1$:

Example $2$: