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RGB7070 - Нийлбэр 1

Өгөгдсөн натурал тоо n хүртэлх натурал тоонуудын нийлбэрийг ол.

Давталт ашиглахгүй болно.

Input

Натурал тоо n өгөгдөнө.

Output

Нийлбэр

Example

Input:
10

Output:
55

Нэмсэн:Bataa
Огноо:2013-01-06
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

hide comments
2020-08-14 03:55:47
sdsdsdsdsdsdsds dfdfdfdfdfdf
2020-05-12 08:32:12
n * (n + 1) / 2
2019-12-29 04:31:14
bodooroi
2019-11-21 04:55:11
#include <iostream>
using namespace std;
int main(){
int n, s;
cin >> n;
s = n * (n + 1) / 2;
cout<< s <<endl;
return 0;
}
2019-11-16 04:54:29
#include<bits/stdc++.h>
using namespace std;
int main(){
int n,a;
cin>>n;
if(n%2==0) (a=n*(n+1)/2);
else a=(n*(n-1)/2+n);
cout<<a;
}
huul
2019-10-28 07:58:09
suguud aaaaaaaaaaaaaaaaaaaaaaaaa
2019-10-12 07:15:20
bang bang
2019-10-10 14:41:20


Last edit: 2019-10-10 14:42:01
2019-10-03 17:57:12
So ez
2019-09-09 15:45:42
arifmetik progressin tomiyogoor bodno
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