#include <bits/stdc++.h>
using namespace std;

int main(){
  int A,B,C;
  cin>>A>>B>>C;
  int a,b,c,ans;
  a=abs(A-B);
  b=abs(A-C);
  c=abs(B-C);
  ans=min(min(a,b),c);
  cout <<ans<<endl;
  

	return 0; 
}