#include <stdio.h>
/**************found**************/
fun (int n)
{int a = 2, b = 1, c, k ;
    double s=0.0 ;
    for (k = 1; k <= n; k++)
    {s = s + 1.0 * a / b ;
/**************found**************/
       c = a; a += b; b = c;
    }
    return(s);
}
main()
{int n = 5 ;
    printf("\nThe value of function is: %lf\n", fun (n));
}