Rocket

A rocket launches with an initial velocity of $V(m/s)$ and moves in a straight line with a constant acceleration $A(m/s^2)$. Determine the first meter of the path that will be covered in less time than a given $T$ (seconds).

Input

The input consists of three real numbers: $A$, $V$, and $T$, separated by spaces.

Output

Output a single integer: the number of the first meter that meets the time requirement.

Examples