polski
Task Sum (sum)
Sum
Memory limit: 32 MB
John got a bad mark in math. The teacher gave him another task. John is to
write a program which computes the sum of integers from 1 to 
. If he
manages to present a correct program, the bad mark will be cancelled.
Task
Write a program which:
- reads the number
from the standard input,
- computes the sum of integers from 1 to
,
- writes the answer to the standard output.
Input
The first and only line of the standard input contains one integer 
(
).
Output
One integer is to be written to the standard output. This integer should
be the sum of integers from 1 to 
.
Example
For the input data:
3
the correct result is:
6
Task author: Piotr Stanczyk.