#include<bits/stdc++.h>
using namespace std;
int n,g,h;
int main(){
	cin>>n;
	while(n>=1){
		g=n%10;
		if(g!=7&&n%7!=0) h+=n;
		n--;
	}
	cout<<h;
	return 0;
}
/**************************************************************
	Problem: 1393
	User: zhangziang
	Language: C++
	Result: Wrong Answer
****************************************************************/