#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
using ll = long long;

int main() {
	int a, b, c;
	cin >> a >> b >> c;
	int m = min(min(abs(a - b), abs(a - c)), abs(b - c));
	if ((a > b > c) || (a < b < c)) cout << "0" << endl;
	
	else cout << m << endl;

	return 0;
}