#include <iostream>
using namespace std;
int main() {
    int v[1000001], n;
    cin >> n;
    for (int i = 0; i < n; i++) cin >> v[i];
    for (int i = 0; i < n; i++) {
        cout << v[i] << " ";
        if ((v[i] + v[i + 1]) % 2 == 0) {
        	if (i == n - 1) {}
        else cout << (v[i] + v[i + 1]) / 2 << " ";
       	}
    } return 0;
}