import std.algorithm, std.container, std.conv, std.math, std.range, std.typecons, std.stdio, std.string;

auto rdsp(){return readln.splitter;}
void pick(R,T)(ref R r,ref T t){t=r.front.to!T;r.popFront;}
void readA(T)(size_t n,ref T[]t){t=new T[](n);auto r=rdsp;foreach(ref v;t)pick(r,v);}

void main()
{
  int[] a; readA(3, a);

  auto r = int.max;
  foreach (p; iota(3).permutations)
    r = min(r, (a[p[1]]-a[p[0]]).abs + (a[p[2]]-a[p[1]]).abs);

  writeln(r);
}
