#include <iostream>
using namespace std;

int countZeros(int a, int b, int c, int d)
{
    return int(a == 0) + int(b == 0) + int(c == 0) + int(d == 0);
}

int main() {
	int varA = 1, varB = 0, varC = 3, varD = 0;
	std::cout << countZeros(varA, varB, varC, varD); 
	return 0;
}