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RGB7214 - Үржвэр нийлбэр 2

1*n+2*(n-1)+3*(n-2)+...+n*1 нийлбэрийг ол.

Input

Натурал тоо өгөгдөнө.

Output

Нийлбэр

Example

Input:
5
Output:
35

Нэмсэн:Bataa
Огноо:2013-01-21
Хугацааны хязгаарлалт:1s
Эх кодын хэмжээний хязгаарлалт:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Програмчлалын хэлүүд:ADA95 ASM32 BASH BF C NCSHARP CSHARP C++ 4.3.2 CPP C99 CLPS LISP sbcl LISP clisp D ERL FORTRAN HASK ICON ICK JAVA JS-RHINO JULIA LUA NEM NICE OCAML PAS-GPC PAS-FPC PERL PHP PIKE PRLG-swi PYTHON PYPY3 PYTHON3 RUBY SCALA SCM guile ST TCL WHITESPACE

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