#include <bits/stdc++.h>
   using namespace std;
   using pii = pair<int, int>;
   using ll = long long;
   #define rep(i, j, n) for(int i = j; i < (int)(n); i++)
   const ll MOD = 1000000007;
   const ll INFL = (1LL << 60);
   const int INFI = (1 << 30);

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