A.cpp

/*****                                            
                                                     __Bismillahir Rahmanir Rahim__
                                               American International University Bangladesh (AIUB) 
                                                          Hadiur Rahman Nabil
                                                                 
                                                               
                                                          
*****/
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef vector <int> vi;

#define INF 1000000007

#define pb push_back
#define mp make_pair
#define endl "\n"



  
int main()
{
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        cout.tie(NULL);



ll t,res=0,n,a,b,c;
cin>>a>>b>>c;


res= max({a,b,c})-min({a,b,c});
cout<<res<<endl;

return 0;

}