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sum of even input numbers up to N | C programming


Sum of even input numbers up to N

 

Problem:

Read an integer value, which is  a Natural number. Find the sum of even numbers up to N.

Input

The input file contains an integer N.

Output

Print the sum of the even numbers up to N.






Solution

In C language:


#include<stdio.h>

int main()
{
    int N,i,sum;
    scanf("%d",&N);


    sum = 0;
    for(i=0;i<=N;i=i+2){
        sum = sum+i;
    }


    printf("%d\n",sum);
    return 0;
}



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