#include<iostream>

using namespace std;

int main(){
    int A,B,C;
    cin>>A>>B>>C;

    int mx=max(A,C);
    int mi=min(A,C);

    if(B>mx){
        cout<<min(B-mx,mx-mi)<<endl;
    }
    else {
        cout<<min(mx-mi,mi-B)<<endl;
    }
}