#include <iostream>
#include <iterator>
#include <set>
#include <algorithm>

using namespace std;

int main()
{	
	istream_iterator<int> begin(std::cin), end;
	
	set<int> remainders;
	transform(begin, end, inserter(remainders, remainders.begin()), bind2nd(modulus<int>(), 37));

	cout << remainders.size();

	return 0;
}