#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

using namespace std;

int main() {

	vector<int> A(3);
	for (int i = 0; i < 3; i++) {
		cin >> A[i];
	}

	sort(A.begin(), A.end());

	int a = A[2] - A[1];
	int b = A[1] - A[0];

	if (a < b) {
		cout << a << endl;
	}
	else {
		cout << b << endl;
	}

	return 0;

}