#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <fstream>
#include <cmath>
#include <stack>
#include <queue>
#include <iomanip>
#include <bitset>
using namespace std;

int main(){
    int n;cin>>n;
    int day = 1;
    while(n!=0){
        if(day%7==0) n+=6;
        n--;
        day++;
    }
    cout << day-1 << endl;
}