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#include <iostream>

using namespace std;

int main()  //"1 - Π΄ΠΎΠ±Π°Π²ΠΈΡ‚ΡŒ ΠΎΡ†Π΅Π½ΠΊΡƒ , 2 - ΠΏΠΎΡΠΌΠΎΡ‚Ρ€Π΅Ρ‚ΡŒ Ρ‚Π΅ΠΊΡƒΡ‰ΠΈΠΉ срСдний Π±Π°Π»Π», 3 - Π²Ρ‹ΠΉΡ‚ΠΈ\n
{
int mark; 
int summ=0;
int avmark=0;
int count=0;
int key=0;
setlocale(LC_ALL, "russian");
while (key != 3) {
	cout << "1 - Π΄ΠΎΠ±Π°Π²ΠΈΡ‚ΡŒ ΠΎΡ†Π΅Π½ΠΊΡƒ , 2 - ΠΏΠΎΡΠΌΠΎΡ‚Ρ€Π΅Ρ‚ΡŒ Ρ‚Π΅ΠΊΡƒΡ‰ΠΈΠΉ срСдний Π±Π°Π»Π», 3 - Π²Ρ‹ΠΉΡ‚ΠΈ\n";
	cin >> key;
	switch (key)
	{
	case 1:
		cout << "input ur mark:";
		cin >> mark;
		mark += summ;
		count += 1;
		break;
	case 2:
		avmark = float(summ) / count;
		cout << "AVERaNGe MARK IS : " << avmark << "\n";
		break;
	case 3:
		cout << "bye lol" << "\n";
	default:
		break;
	}
}

}