#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 10000000000000000



int main(){
	
	int A,B,C;
	cin>>A>>B>>C;
	
	cout<<min({abs(A-B),abs(B-C),abs(A-C)})<<endl;

	return 0;
}