#include <bits/stdc++.h>
#ifdef _DEBUG
#include "debug.hpp"
#else
#define debug(...)
#endif
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define precise(i) fixed << setprecision(i)
using ll = int64_t;
using ul = uint64_t;
using namespace std;

void solve() {
  int a, b, c;
  cin >> a >> b >> c;

  if ((c < a && a < b) || (b < a && a < c)) {
    cout << min(abs(b - a), abs(a - c)) << endl;
  } else {
    cout << min(abs(a - c), abs(b - c)) << endl;
  }
}

void wrapper() {
  rep(i, 4) {
    cout << "[TEST " << i << "]\n";
    solve();
    cout << "\n";
  }
}

int main() {
  fastIO;
#ifdef _DEBUG
  wrapper();
#else
  solve();
#endif
}