#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<(n); ++i)
using namespace std;
using ll=long long;
int main(){
    int a,b,c;
    cin>>a>>b>>c;
    int x=min(abs(a-b),abs(c-b));
    cout<<x<<endl;
}