#include <bits/stdc++.h>
#define MOD 998244353
#define mod 1000000007
#define ll long long
#define ull unsigned long long
#define ui unsigned int
using namespace std;
const int maxn = 1e6+9;
int main()
{
	set<int>s;
	int a;
	for (int i = 1; i <= 10; i++)
	{
	    cin >> a;
	    s.insert(a);
	    /*+-
	    +-*/
	    /*+-
	    +-*/
    }
    cout << s.size();
	return 0;
}