Программа: С++.........

#include <iostream>

#include <vector>

using namespace std;

signed main() {

   const int n = 7;

   vector<int> a(n);

   int max_elem = -INT_MAX, not_null_cnt = 0;

   for(auto &i: a){

       cin >> i;

       max_elem = max(max_elem,i);

       not_null_cnt += i != 0;

   }

   cout << "max elem = " << max_elem << "\n";

   cout << "amount of not null elems: " << not_null_cnt;

}