#include <cmath>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
	int A, B, C;
	cin >> A >> B >> C;
	if (A == B || A == C || B == C || (B != max({ A, B, C }) && B != min({ A, B, C }))) {
		cout << 0 << endl;
	}
	else {
		cout << min({ abs(A - B), abs(A - C), abs(B - C) }) << endl;
	}
	return 0;
}