#include<iostream>
#include<bits/stdc++.h>
using namespace std;
int main()
{
int a,b,c;
cin>>a>>b>>c;
if((a>b)&&(b>c))
cout<<a-c<<endl;
if((a>c)&&(c>b))
cout<<a-b<<endl;
if((b>a)&&(a>c))
cout<<b-c<<endl;
if((b>c)&&(c>a))
cout<<b-a<<endl;
if((c>b)&&(b>a))
cout<<c-a<<endl;
if((c>a)&&(a>b))
cout<<c-b<<endl;
if((a==0)&&(b==0)&&(c==0))
cout<<0<<endl;
return 0;
}
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