somatorio impar

# include<stdio.h>
# include<stdlib.h>
int impares (int n);

int main (void)
{
int n, sm;
printf("digite o valor de n\n");
scanf("%d", &n);
sm=impares(n);
printf("%d\n", sm);
system("pause");
return 0;
}

int impares (int n)
{
int i,s=0;
for(i=1;i<=n;i++)
{
if(i%2==1)
{
s=s+i;
}
}
return s;
}