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

int main() {
    int a,b,c;
    cin >> a >> b >> c;
    int d = min(a,c),flag = 0;
    if(d < b) flag++;
    if(flag == 1){
        if(abs(a-c) <= abs(max(a,c)-b)){
          cout << abs(a-c) << endl;
        }
        else{
          cout << abs(max(a,c)-b) << endl;
        }
    }
    else{
       if(abs(a-c) <= abs(min(a,c)-b)){
           cout << abs(a-c) << endl;
       } 
       else{
           cout << abs(min(a,c)-b) << endl;
       }
    }
}