#include <iostream>
using namespace std;

int main()
{
	int a, b, c, d, amount = 1;
	cout << "Print number = ";
	cin >> a >> b >> c >> d;
	if (a == b == c == d) amount *= 4;
	else if (a == b && c == d) amount *= 2;
	else if (a == c && b == d) amount *= 2;
	else if (a == d && c == b) amount *= 2;
	else if (a == b == c) amount *= 3;
	else if (a == b == d) amount *= 3;
	else if (a == c == d) amount *= 3;
	else if (d == b == c) amount *= 3;
	else if (a == b) amount *= 2;
	else if (a == c) amount *= 2;
	else if (a == d) amount *= 2;
	else if (b == c) amount *= 2;
	else if (b == d) amount *= 2;
	else if (c == d) amount *= 2;
	else amount = 0;
	cout << amount;
	return 0;
}