#include <bits/stdc++.h>
using namespace std;
int main() {
  int a[5] = {}, x, y = 0;
  cin >> a[0] >> a[1] >> a[2];
  for (int d = 0; d < 3; d++) {
    for (int c = 0; c < 3; c++) {
      if (a[d] > a[c]) swap(a[d], a[c]);
    }
  }
  x = a[1];
  if (a[0] > x) y += a[0] - x;
  if (a[0] < x) y += x - a[0];
  if (a[2] > x) y += a[2] - x;
  if (a[2] < x) y += x - a[2];
  cout << y;
  return 0;
}
