Submission #2544554

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Source Code Expand

//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>

using namespace std;
#define EPS (1e-7)
#define DEF (1e+9 + 7)

#define SORT(c) sort((c).begin(),(c).end())
#define ANS(ans) cout<<(ans)<<endl;
typedef vector<int> VI;


//repetition
//------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define REP(i,n)  for (int i = 0; i < (n); ++i)





int main() {
	long long x;
	cin >> x;

	long long ans = x / 11*2;
	int i;
	i = x - 11 * ans;
	if (i >= 7 && i<=10) {
		ans+=2;
	}
	else {
		ans++;
	}
	cout << ans << endl;

	return 0;
}

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