#include <iostream>
#include<math.h>
using namespace std;

int main()
{
long long int b;
long long int ac[2];
cin >> ac[0] >> b >> ac[1];
long long int ans = min(abs(ac[0] - b),min(abs(ac[0] - ac[1]),abs(ac[1] -b)));
cout << ans;
   return 0;
}