#include<fstream.h>
unsigned long n,k=1;

int numara(unsigned long a,unsigned long b)
	 {
	 if(a>n||b>n) return 0;
	 return 1+numara((a+b),b)+numara(a,a+b);
	 }

int main()
{
ifstream in("fractii.in");
in>>n;
in.close();
k=numara(1,1);
ofstream out("fractii.out");
if(n>0) out<<k<<'\n';
else out<<0<<'\n';
out.close();
return 0;
}