#include<stdio.h>
int cmmdc(int a, int b){        
     if(b==0) return a;        
     return cmmdc(b, a%b);     
}
int increase(int a, int b){
	if(cmmdc(a, b)==1) return 1;
	else return 0;}
int f(int n, int k){
	int v[1000]={0};
	int s=0;
	for(int i=1; i<=n; ++i)
		if(v[i]==0)
				for(int j=0; i+k*j<=n;++j){
					v[i+k*j]=1;
					s=s+increase(i, k);}
	return s;
}
	




int main(){
	freopen("fractii.in", "r", stdin);
	freopen("fractii.out", "w", stdout);
	int n;
	int s=0;
	scanf("%d", &n);
	for(int i=1; i<=n; ++i){
		s=s+f(n, i);}
	printf("%d", s);
	
	
	
	
	
	
	
	
	
	
	
	
	return 0;}