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RGB7204 - Эхний n тооны нийлбэр

Эхний n тооны нийлбэрийг тодорхой давталт ашиглан ол.

Input

Int төрлийн эерэг бүхэл тоо өгөгдөнө.

Output

1-ээс n тооны нийлбэр.

Example

Input:
5

Output:
15

Нэмсэн:Bataa
Огноо:2011-06-12
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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2024-03-25 04:10:42
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2024-02-29 03:23:36
7-1 duun
2024-02-29 03:23:23
mna surguulinh n huularai
2024-02-29 03:22:59
#include <iostream>
#include <sstream>
#include <string>
#include <cstdlib>
#include <cmath>

using namespace std;

// Headers
string toString (double);
int toInt (string);
double toDouble (string);

int main() {
int n, s, i;

s = 1;
cin >> n;
for (i = 2; i <= n; i++) {
s = s + i;
}
cout << s << endl;
return 0;
}

// The following implements type conversion functions.
string toString (double value) { //int also
stringstream temp;
temp << value;
return temp.str();
}

int toInt (string text) {
return atoi(text.c_str());
}

double toDouble (string text) {
return atof(text.c_str());
}
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