Submission #3015365

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Source Code Expand

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <functional>
#include <queue>
#include <string>
#include <cstring>
#include <numeric>
#include <cstdlib>
#include <cmath>
using namespace std;

typedef long long ll;

#define INF 10e10
#define rep(i,n) for(int i=0; i<n; i++)
#define rep_r(i,n,m) for(int i=m; i<n; i++)
#define MAX 100
#define MOD 1000000007
#define pb push_back

/* add vars here */

ll x;

/* add your algorithm here */

int main() {
  cin >> x;

  ll ans = x / 11;
  ans *= 2;
  int a = x % 11;
  if (a != 0) {
    if (a > 6)
      ans += 2;
    else
      ans += 1;
  }

  cout << ans << endl;
}

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