#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;



int main() {


    long A,B,C;
    cin>>A>>B>>C;


    cout << min(min(abs(A-B),abs(A-C)),abs(B-C)) << endl;

    return 0;
}