#include<stdlib.h>
#include<stdio.h>
int x=0;
int numara(int i,int j,int n){
if(i<=n && j<=n){
	x++;
	numara(i,i+j,n);
	numara(i+j,j,n);
	}
	return 0;
        }
int main()
{
	FILE *f,*g;
	f = fopen("fractii.in","r");
	g = fopen("fractii.out","w");
    int n;
        fscanf(f,"%d",&n);
	numara(1,1,n);
	fprintf(g,"%d",x);
	fclose(f);
	fclose(g);
  return 0;
}