#include<bits/stdc++.h>
using namespace std;
int main() {
	int abc,a,b,c;
	cin >> abc;
	a = abc / 100;
	b = (abc % 100) / 10;
	c = (abc % 100) % 10;
	cout << max({a,b,c}) - min({a,b,c}) << endl;
}