A

main.cc

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main(int argc, char **argv) {
//    ios::sync_with_stdio(false);
    srand(time(0));

#ifndef ONLINE_JUDGE
    freopen("/home/acarus/input.txt", "r", stdin);
#endif

    int n, x;
    scanf("%d", &n);
    int xMin = INT_MAX, xMax = INT_MIN;
    for (int i = 0; i < n; ++i) {
        scanf("%d", &x);
        xMin = min(xMin, x);
        xMax = max(xMax, x);
    }
    printf("%d\n", xMin + (xMax - xMin) / 2);
    return 0;
}