// B

#include <bits/stdc++.h>
using ll = long long;
using namespace std;
ll mod=1e9+7;
#define pa(x,n) for(ll i=0;i<n;i++){cout<<(x[i])<<" \n"[i==n-1];};

int main(){
  int A,B,C;
  cin>>A>>B>>C;
  int ans(0);
  ans = min(abs(A-B),min(abs(B-C),abs(C-A)));
  cout << ans << endl;
  return 0;
}