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>
#include <stdlib.h>
#include <math.h>
int main()
{
int i, n, sum = 0;
/*if(scanf("%d", &n) != EOF)
{for(i = 1; i <= n; i++)
sum += i;
printf("%d\n", sum);}*/
while(scanf("%d", &n) != EOF)
{
sum = 0;
for(i = 1; i <= n; i++)
sum += i;
printf("%d\n\n", sum);
}
return 0;
}