#include <iostream>
using namespace std;

void NhapMang(int a[], int n);
void NhapMang(int a[], int n)
{
	for (int i = 1; i <= n; i++)
	{
		cout << "Phan tu thu " << i << " la :";
		cin >> a[i];
	}
}

int DemPhanTu(int a[], int n)
{
	int dem = 0;
	for (int j = 1; j <= n;j++)
	{
		for (int i = j+1; i <= n; i++)
		{
			if (a[j] == a[i])
			{
				dem = dem + 1;
				break;
			}
			else i++;
		}
	}
	cout << "So phan tu khac nhau co trong mang la :" << n - dem ;
	return 1;
}
int main()
{
	int n;
	int a[1000];
	cout << "So phan tu cua mang la:";
	cin >> n;
	int dem = 0;
	NhapMang(a, n);
	DemPhanTu(a, n);
	return 1;
}