#include <bits/stdc++.h>
 
using namespace std;
#define fio ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define ll long long
#define loop(n) for(int i=0;i<n;i++)
#define YES cout<<"YES"
#define NO cout<<"NO"
#define Yes cout<<"Yes"
#define No cout<<"No"
#define yes cout<<"yes"
#define no cout<<"no"
#define ef else if
#define dd double
 
ll factorial(ll n)
{
    if (n == 0 || n == 1)
        return 1;
    return n * factorial(n - 1);
}
 
int main()
{
    fio;
    int x1,x2,x3;
    cin >> x1 >> x2 >> x3;
    int arr[3] {x1,x2,x3};
    sort(arr,arr+3);
    cout << abs(arr[0] - arr[1]) + abs(arr[2] - arr[1]);
    return 0;
}
 

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