50574 - Triangular Numbers

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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.

Triangular Numbers

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Square Numbers are the numbers which can be represented as a square; like 4, 16 or 25.

Triangular Numbers are similar to square numbers but they form a triangle.

Write a program that is going to accept an integer number and decide if the number is a triangular number or not.

Input specification
There will be just one integer number n where 1 ≤ n ≤ 1 billion.

Output specification
Print out "YES" if the given number is a triangular number. "NO", otherwise.

Sample Input:
5

Sample Output:
NO

Sample Input:
21

Sample Output:
YES

Для отправки решений необходимо выполнить вход.

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50574 - Triangular Numbers

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Triangular Numbers