#include <bits/stdc++.h>
using namespace std;

int main() {
	int A, B, C;
	cin >> A >> B >> C;

	int cnt = 0;
	vector<int> v = { A, B, C };
	sort(v.begin(), v.end());
	int n1, n2, n3;
	n1 = v.at(0);
	n2 = v.at(1);
	n3 = v.at(2);

	if ((A != B) && (A != C) && (B != C)) {
		if (n2 != B) {
			int a1, a2, a3;
			a1 = n2 - n1;
			a2 = n3 - n2;

			if (a1 < a2) {
				cnt = a1;
			}
			else {
				cnt = a2;
			}
		}
	}

	cout << cnt << endl;
}