#include<iostream>
#include<random>
using namespace std;
int K;
main()
{
	cin>>K;
	mt19937 rng(114514);
	int sum=0;
	for(int c=0;c<1000000;c++)
	{
		int cnt=0,now=0;
		while(now!=K)
		{
			now+=rng()%6+1;
			cnt++;
			if(now>K)now=0;
		}
		sum+=cnt;
	}
	cout<<sum/1e6<<endl;
}