#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;
	int a[101];
	for(int i = 0; i < n; i++)
	{
		cin >> a[i];
	}
	int diffNum = 0;
	for(int i = 0; i < n; i++)
	{
		bool newNum = true; 
		for(int j = 0; j < i; j++) 
		{
			if(a[j] == a[i])
			{				
				newNum = false;
				break;
			}	
		}
		if(newNum == true)
		{
			diffNum++;
		}
	}
	cout << diffNum;
	return 0;
}