include

using namespace std;

int main {
int arr$$5$$$$5$$ = {{1, 2, 3, 4, 5},
{6, 7, 8, 9, 10},
{11, 12, 13, 14, 15},
{16, 17, 18, 19, 20},
{21, 22, 23, 24, 25}};

int sum = 0;
int count = 0;
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 5; j++) {
sum += arr$$i$$$$j$$;
count++;
}
}
float average = sum / $float$count;
cout << "Среднее арифметическое элементов массива: " << average << endl;
return 0;

}