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#include <iostream>
#include <map>

typedef struct taskDate {
	int x;
	int d;
	int h;
	int m;
};

typedef std::map<int, int> taskToDay;


void prog_main(std::istream& in, std::ostream& out)
{
	taskToDay pub = {
		{1, 23},
		{2, 24},
		{3, 25},
		{4, 26},
		{5, 27}
	};
	taskToDay sub = {
		{1, 24},
		{2, 25},
		{3, 26},
		{4, 27},
		{5, 29}
	};
	taskDate start{};
	in >> start.x;
	in >> start.d;
	in >> start.h;
	in >> start.m;

	taskDate end{start.x, sub[start.x], 23, 59};
	int result = (end.d - start.d) * 24 * 60;
	result += (end.h - start.h) * 60;
	result += (end.m - start.m);
	result += 1;
	if (start.x == 5 ) {
		if (start.d < 29 || 
			(start.d == 29 && start.h <= 1) || 
			(start.d == 29 && start.h == 2 && start.m == 0)) {
			result -= 60;
		} 
	}
	out << result << std::endl;

}

#ifndef TEST
int main(int argc, char* argv[])
{
	prog_main(std::cin, std::cout);
	return 0;
}
#endif