#include <bits/stdc++.h>

using namespace std;

int main(int argc, char **argv) {
	struct tm t;

	t.tm_year = 115;
	t.tm_mon = 0;
	t.tm_mday = 1;
	t.tm_hour = 0;
	t.tm_min = 0;
	t.tm_sec = 0;

	int sum = 0;
	for (int i = 0; i < 365; i++) {
		time_t mt = mktime(&t);
		if (t.tm_mon + 1 == (t.tm_mday / 10 + t.tm_mday % 10)) {
			//printf("month = %d, day = %d\n", t.tm_mon + 1, t.tm_mday);
			sum++;
		}
		t.tm_mday++;
	}

	printf("%d\n", sum);
	return 0;
}