Submission #1319056

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Source Code Expand

//#define LOCAL

#include <fstream>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <string>
#include <map>
#include <vector>
#include <climits>

#define rep(i,n) for(int i=0; i<n; i++)

#define int long long

using namespace std;

signed main()
{
#ifdef LOCAL
    ifstream in("input.txt");
    cin.rdbuf(in.rdbuf());
#endif

    int x;
    
    cin >> x;
    
    int ans = (x / 11) * 2;
    x %= 11;
    if (x != 0) {
        if (x <= 6) ans++;
        else ans += 2;
    }
    
    cout << ans << endl;
}

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