Score : 200 points
There is a kangaroo at coordinate 0 on an infinite number line that runs from left to right, at time 0. During the period between time i-1 and time i, the kangaroo can either stay at his position, or perform a jump of length exactly i to the left or to the right. That is, if his coordinate at time i-1 is x, he can be at coordinate x-i, x or x+i at time i. The kangaroo's nest is at coordinate X, and he wants to travel to coordinate X as fast as possible. Find the earliest possible time to reach coordinate X.
The input is given from Standard Input in the following format:
X
Print the earliest possible time for the kangaroo to reach coordinate X.
6
3
The kangaroo can reach his nest at time 3 by jumping to the right three times, which is the earliest possible time.
2
2
He can reach his nest at time 2 by staying at his position during the first second, and jumping to the right at the next second.
11
5