#include <bits/stdc++.h>
using namespace std;
int main() {
  int x;
  cin >> x;
  x = abs(x);
  int pos = 0;
  int i;
  for (i = 1; pos < x; i++) pos += i;
  int diff = pos - x;
  if (diff % 2 == 0)
    cout << (i - 1) << endl;
  else {
    if (i % 2 != 0)
      cout << i << endl;
    else
      cout << i + 1 << endl;
  }
}
