杭电ACM 1001 Sum Problem

Sum Problem


Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 179967    Accepted Submission(s): 42721




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

I x, y, i;I sum;I main(){    W ( ~S("%d", &x) ){        sum = 0;        F ( i=1; i<=x; ++i ){            sum += i;        }        P("%d\n\n", sum);    }    R 0;}