#include<bits/stdc++.h>
using namespace std;
typedef unsigned long long int ull;
typedef long long int ll;
typedef pair<ll,ll> pll;
typedef long double D;
//typedef complex<D> P;
#define F first
#define S second
const ll MOD=1000000007;
//const ll MOD=998244353;

template<typename T,typename U>istream & operator >> (istream &i,pair<T,U> &A){i>>A.F>>A.S; return i;}
template<typename T>istream & operator >> (istream &i,vector<T> &A){for(auto &I:A){i>>I;} return i;}
template<typename T,typename U>ostream & operator << (ostream &o,const pair<T,U> &A){o<<A.F<<" "<<A.S; return o;}
template<typename T>ostream & operator << (ostream &o,const vector<T> &A){int i=A.size(); for(auto &I:A){o<<I<<(--i?" ":"");} return o;}



int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  ll A,B,C;
  cin>>A>>B>>C;
  ll ans=min(abs(A-B),min(abs(B-C),abs(A-C)));
  if(A<B && B<C){ans=0;}
  if(A>B && B>C){ans=0;}
  cout<<ans<<endl;

  return 0;
}