#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 x1=abs(a-c);
    int x2=abs(a-b);
    int x3=abs(b-c);
    int ans=min(x1,min(x2,x3));
    cout<<ans<<endl;
}