#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;


int main(){
  int A, B, C;
  cin >> A >> B >> C;

  int ret = A;
  if(B>A){
    ret = min(ret, B-A);
  }else{
    ret = min(ret, A-B);
  }
  if(B>C){
    ret = min(ret, B-C);
  }else{
    ret = min(ret, C-B);
  }
  if(A>C){
    ret = min(ret, A-C);
  }else{
    ret = min(ret, C-A);
  }

  cout << ret << endl;
  
  return 0;
}