#1和#5WA了 大佬帮忙看一下

#include<bits/stdc++.h>
using namespace std;
int main() {
	int a,sum=0,min=100000;
	cin>>a;
	if(a%11==0){
		min=a/11;
	}if(a%5==0){
		min=a/5;
	}
	sum+=a/11;
	a%=11;
	sum+=a/5;
	a%=5;
	sum+=a;
	if(sum<min){
		cout<<sum;
	}else{
		cout<<min;;
	}
}