#include<bits/stdc++.h>
using namespace std;
using ll=long long;
#define rep(i,p,n)for(ll i=(ll)p;i<(ll)n;i++)
#define all(x)(x).begin(),(x).end()
#define edt(x1,y1,x2,y2)sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2))

int main() {
    ll A,B,C;
    cin>>A>>B>>C;
    ll ans=min(min(abs(A-B),abs(B-C)),abs(C-A));
    cout<<ans<<endl;
    return 0;
}