Category
Similar Problems
0747. Sum
Time limit : 1000 ms
Memory limit : 64 mb
Your task is to find the sum of all integer numbers from 1 to N inclusive.
Input
The input consists of a single positive integer N(1≤N≤4∙109).
Output
Write a single integer number that is the sum of all integer numbers from 1 to N inclusive.
Samples
|
№ |
Input |
Output |
|
1 |
3 |
6 |