#include <iostream>
using namespace std;
int main()
{
int a,b,c,maxim=0,mm;
cin>>a;
int minim=a;
if(a>maxim) maxim=a;
cin>>b;
if(b>maxim) maxim=b;
if(b<minim) minim=b;
cin>>c;
if(c>maxim) maxim=c;
if(c<minim) minim=c;
mm=maxim-minim;
cout<<mm;
return 0;
}