`\color{pink}{#Thỏ}`

#include<bits/stdc++.h>
#define ll long long
#define abs(x) ((x)<0?-(x):(x))
using namespace std;

int main() {
    ll a, b, c;
    cin >> a >> b >> c;
    double d = (abs(a - b) + abs(a - c) + abs(b - c)) / 3.0;
    cout << fixed << setprecision(2) << d;
}

 `\color{#1AD5F7}{꧁⋆⟡T}\color{#1AD5F7}{D}\color{#4DA6E6}{u}\color{#668EDD}{n}\color{#8077D5}{g}\color{#995FCD}{G}\color{#EA2F90}{M⟡⋆꧂}`