C++ :

#include<bits/stdc++.h>
using namespace std;
long long a[5]; 
int main(){
	//freopen("1610.in","r",stdin);
	//freopen("1610.out","w",stdout);	
    cin>>a[1]>>a[2]>>a[3];
    sort(a+1,a+4);
    cout<<a[3]-a[1];

    return 0;
}