#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b=0;
	cin>>a;
	int c[81]={1,2,4,6,8,10,12,14,16,18,3,6,9,12,15,18,21,24,27,4,8,12,16,20,24,28,32,36,5,10,15,20,25,30,35,40,45,6,12,18,24,30,36,42,48,54,7,14,21,28,35,42,49,56,63,8,16,24,32,40,48,56,64,72,9,18,27,36,45,54,63,72,81,2,3,4,5,6,7,8,9};
	for(int i=0;i<=81;i++)
	{
		if(c[i]!=a)
		{
			b+=c[i];
		}
	}
	cout<<b;		
	return 0;
}

暴力