WAP to SUM the Fibonnaci Series

#include
#include
long int fib(long int);
int main()
{
long int sum=0;
long int k;
int i,n;
printf("\nEnter the number of element in the series : ");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
k=fib(i);
sum=sum+k;
}
printf("sum of %ld",sum);
return (0);
}
long int fib(long int n)
{
if(n<=1)
{
return n;
}
else
{
return fib(n-1)+fib(n-2);
}
}