Problem-7

#include<stdio.h>
int sum_even(int n)
{
    int i,sum=0;
    for(i=2;i<=n;i+=2)
    {
        sum+=i;
    }
    printf("%d", sum);
}
int main()
{
    int n;
    scanf("%d", &n);
    sum_even(n);
    return 0;
}