1001 Sum Problem

Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 190841    Accepted Submission(s): 45631

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(void)
{ 
int a, b; 
while (scanf("%d%d", &a, &b) != EOF)
{ 
printf("%d\n", a + b); 
} 
return 0; 
}