B2147 求 f(x,n)

#include
#include
double f(double n,double x)
{
	if(n==1)
	return sqrt(n+x);
	else
	return sqrt (n+f(n-1,x));
}
int main()
{
	double x,n;
	scanf("%lf %lf",&x,&n);
	printf("%.2lf",f(n,x));
	return 0;
}