#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
const int INF = 1e9;
const int MOD = 1000000007;

int main(){
    int a,b,c,ans;
    cin >> a >> b >> c;
    if(a > c) swap(a,c);
    if(b == max({a,b,c})){
        ans = min(abs(b-c),abs(a-c));
    }else{
        ans = min(abs(a-b),abs(a-c));
    }
    cout << ans << endl;
    return 0;
}