#include<bits/stdc++.h>
using namespace std;
#define ALL(x) x.begin(),x.end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define debug(v) cout<<#v<<":";for(auto x:v){cout<<x<<' ';}cout<<endl;
#define INF 1000000000
#define mod 1000000007
using ll=long long;
const ll LINF=1001002003004005006ll;
int dx[]={1,0,-1,0};
int dy[]={0,1,0,-1};
// ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
template<class T>bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template<class T>bool chmin(T &a,const T &b){if(b<a){a=b;return true;}return false;}

// Bが最大値or最小値で，3値が全て異なれば角松

bool isKad(ll a,ll b,ll c){
    if(a==b or b==c or c==a) return false;
    return max({a,b,c})==b or min({a,b,c})==b;
}

signed main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    ll a,b,c;cin>>a>>b>>c;
    ll cost=min({abs(a-b),abs(b-c),abs(c-a)});
    cout<<cost<<endl;
    return 0;
}