Sum Problem

Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 224323    Accepted Submission(s): 55032

Problem Description

Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge). In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n.

 

Input

The input will consist of a series of integers n, one integer per line.

 

Output

For each case, output SUM(n) in one line, followed by a blank line. You may assume the result will be in the range of 32-bit signed integer.

 

Sample Input

1 100

 

Sample Output

1 5050

#include<stdio.h>

int main()
{
  int n;
while(scanf("%d",&n)!=EOF)
{
  int i,s=0;
   for(i=1;i<=n;i++)
{
  s+=i;}
printf("%d\n\n",s);
   }
  return 0;
}