Problem2169--Cumulative summation

2169: Cumulative summation

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 0  Solved: 0
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Description

Write a program that reads n, and outputs the sum from 0 to n-1 in steps of 1,

Input

Given a positive integer n

Output

The sum of the values from 0 to n-1

Sample Input Copy 

4

Sample Output Copy 

6

Source/Category

10 
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