Problem2113--Sum of sequences

2113: Sum of sequences

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 113  Solved: 13
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Description

This problem requires printing the sum of 1 + (1 + 2) +... + (1 + 2 + 3 +... + n.

Input

Given a positive integer n

Output

The sum of 1 + (1 + 2) +... + (1 + 2 + 3 +... + n)

Sample Input Copy 

1

Sample Output Copy 

1

Source/Category

150 
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