func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long b, d, s, x, y, z, m, t;     x = y = z = 0;     cin >> b >> d >> s;     long long a[3] = {b, d, s};     sort(a, a + 3);     if (a[0] == a[2]) {       cout << 0;     } else if (a[1] == a[2]) {       cout << a[2] - a[0] - 1;     } else {       cout << 2 * a[2] - a[0] - a[1] - 2;     }     return 0;   }   