#include <iostream>
#include <algorithm>
using namespace std;
int number_times_appear(int digit, int number)
{
	int total = 0;
	string stringNumber = to_string(number);
	char charDigit =  '0' + digit;
	
	total = count(stringNumber.begin(), stringNumber.end(), charDigit);
	return total;
}
int main() {
	cout << number_times_appear(1, 1911);
	return 0;
}