func_code_string: #include <bits/stdc++.h>   using namespace std;   int sdf[30] = {4,   22,  27,  58,  85,  94,  121, 166, 202, 265,                  274, 319, 346, 355, 378, 382, 391, 438, 454, 483,                  517, 526, 535, 562, 576, 588, 627, 634, 636, 645};   long long int a[71720], b, c, d, n, m, i, j, k, sum, sumend;   bool cmp(int a, int b) { return a > b; }   int gcd(int a, int b) {     if (!b) return a;     return gcd(b, a % b);   }   int gqt(int n) {     if (!n || n) return 0;     if (n == 2) return 1;     for (int i = 3; i <= sqrt(n); i++)       if (n % i == 0) return 0;     return 1;   }   int main() {     cin >> n;     for (i = 1; i <= n; i++) cin >> a[i];     sum = a[n];     sort(a + 1, a + n + 1);     sumend = a[n];     cout << (sumend ^ sum) << endl;     return 0;   }   