#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<utility>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<functional>
#include<math.h>
#include<random>
#include <bitset>
using namespace std;
#define N (1000000000+7)
//#define N 998244353
#define INF 1e16
typedef long long ll;
typedef pair<int,int> P;
typedef pair<int,P> Q;

const int inf = (int)1e9; 

ll gcd(ll a, ll b) {
	if (b > a) {
		ll tmp = b;
		b = a;
		a = tmp;
	}
	if (a%b == 0)return b;
	else return gcd(b, a%b);
}

bool prime[1000010];
void furui() {
	int i = 2;
	while (i <= 1000000) {
		int j = 2;
		while (j*j <= i && !prime[i]) {
			if (i%j == 0) {
				prime[i] = true;
				break;
			}
			else j++;
		}
		int z = 2;
		while (!prime[i]) {
			if (i*z <= 1000000) {
				prime[i*z] = true;
				z++;
			}
			else break;
		}
		i++;
	}
}

int main(void){
	int a,b,c;
	cin>>a>>b>>c;
	cout<<min(max(a,b)-min(a,b),min(max(b,c)-min(b,c),max(c,a)-min(c,a)))<<endl;
	return 0;
}