#include <bits/stdc++.h>
using namespace std;
int main(){
	int i,sum=0;
	cin>>i;
	for(int i1=1;i1<=i;i1++){
		for(int i2=1;i2<i1;i2++){
			if((i1+i2)%7==0||(i1+i2)%3==0)sum++;
		}
	}
	cout<<sum;
	return 0;
}
/**************************************************************
	Problem: 1086
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/