#include <bits/stdc++.h>
using namespace std;

#ifdef DEBUG_
#include <compe/debug.hpp>
#else
#define dump(...)
#endif

#define FastIO cin.tie(nullptr), ios_base::sync_with_stdio(false);
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define out(msg) cout << (msg) << '\n'
#define die(msg)         \
  do {                   \
    cout << msg << endl; \
    exit(0);             \
  } while (0)
#define all(k) k.begin(), k.end()
#define rall(k) k.rbegin(), k.rend()
#define INFi 1 << 30
#define INFll 1LL << 60

template <typename T> bool chmax(T& a, const T& b) {
  return ((a < b) ? (a = b, true) : (false));
}
template <typename T> bool chmin(T& a, const T& b) {
  return ((a > b) ? (a = b, true) : false);
}

using llint = long long int;

bool is_a_kadomatsu(int a, int b, int c) {
  bool flag{false};
  flag |= b > a && a > c;
  flag |= b < a && a < c;
  flag |= c > a && a > b;
  flag |= c < a && a < b;
  return flag;
}

bool is_c_kadomatsu(int a, int b, int c) {
  bool flag{false};
  flag |= b < c && c < a;
  flag |= b > c && c > a;
  flag |= a < c && c < b;
  flag |= a > c && c > b;
  return flag;
}

int main() {
  FastIO;
  llint a, b, c;
  cin >> a >> b >> c;

  llint ans{10000000001};
  if (is_a_kadomatsu(a, b, c)) {
    chmin(ans, min(abs(a - b), abs(a - c)));
  }

  if (is_c_kadomatsu(a, b, c)) {
    chmin(ans, min(abs(a - c), abs(b - c)));
  }

  out(ans);
}