func_code_string: #include <bits/stdc++.h>   using namespace std;   long long ans, n, k, m, v, l, r, asdfghjkl, qwertyui, zxcvbnm, oiuytre,       lkjgfdsa, mnbvcxz, x, y;   long long i, j, a[100002], b[100002], d[100002], l1, l2, r1, r2;   long long mn, xm, ym, mnd, mnv, pos;   long long s;   char c;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     cin >> a[0] >> a[1] >> a[2];     sort(a, a + 3);     if (a[2] == a[1] && a[1] == a[0]) return cout << 0, 0;     if (a[2] == a[1]) {       ans = a[2] - a[0] - 1;       cout << ans;       return 0;     }     ans = 2 * a[2] - a[1] - a[0] - 2;     cout << ans;   }   