#include <bits/stdc++.h>
using namespace std;
int moves[] = {2, 2, -1, -1, 2, -1, -1};

static inline void solve() {
  int x;
  cin >> x;
  long long sum = 0;
  int cur = 0;
  for (int i = 0; i < 100; i++) {
    if (cur == x) {
      cout << sum << '\n';
      return;
    }
    for (int j = 0; j < 7; j++) {
      if (cur == x) {
        cout << sum << '\n';
        return;
      }
      int m = moves[j];
      cur += m;
      sum += abs(m);
    }
  }
}

int main() {
  ios_base::sync_with_stdio(0), cin.tie(0);
#ifdef LOCAL
  int T;
  cin >> T;
  for (int tc = 1; tc <= T; tc++) {
    cout << "Case" << tc << ":" << '\n';
    solve();
  }
#else
  solve();
#endif
  return 0;
}