#include <iostream>
#include <string>
#include <algorithm>
#define llint long long

using namespace std;

llint a, b, c;

int main(void)
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> a >> b >> c;
	
	if(a < b){
		cout << min(abs(a-c), b-max(a, c)) << endl;
	}
	else{
		cout << min(abs(a-c), min(a, c)-b) << endl;
	}
	
	return 0;
}