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#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <vector>
#include <cstdlib>
#include <chrono>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <cassert>
#include <queue>
#include <algorithm>
#include <string>
#include <cmath>

struct TestData;
void solve(TestData& t);
void io_solve(TestData& t, FILE* input, FILE* output);
void test();

#if _WIN32
#	define DO_TESTS 1
#	if DO_TESTS
#		define DO_LOGS 1
#	else
#		define DO_LOGS 0
#	endif
#else
#	define DO_LOGS 0
#	define DO_TESTS 0
#endif

#if DO_LOGS
auto time_start = std::chrono::high_resolution_clock::now();

#	define DEB(...) do { \
	auto duration_from_start = std::chrono::high_resolution_clock::now() - time_start;	\
	auto micros = std::chrono::duration_cast<std::chrono::microseconds>(duration_from_start).count(); \
	fprintf(stderr, "# %lld.%06lld ", micros/1000000, micros%1000000); \
	fprintf(stderr, __VA_ARGS__); \
	fputc('\n', stderr); \
} while (0)
#else
#	define DEB(...) do {} while (0);
#endif

struct TestData {
	int x, d, h, m;

	int64_t result;

	TestData() {}
};

int main() {
#if DO_TESTS
	test();
#else
	FILE* input = stdin;
	FILE* output = stdout;

#if _WIN32
	const char *file = nullptr;
	//file = "in/r3d-x_1_tak.txt";
	if (file != nullptr) input = fopen(file, "r");
	if (input == NULL) {
		input = stdin;
	} else {
# 	  if 0
		std::string out_file = file;
		out_file += "_out.log";
		output = fopen(out_file.c_str(), "w");
#	  endif
	}
#endif
	TestData t;

	io_solve(t, input, output);
#endif
	return 0;
}

void solve(TestData& t);

#if DO_TESTS

void test_files() {
	std::vector<std::string> files = {
		"in/zmi0.in",
		"in/zmi1.in",
	};
	for (int i = 0; i < files.size(); ++i) {
		DEB("test %d %s", i, files[i].c_str());
		FILE* file = fopen(files[i].c_str(), "r");
		if (file == nullptr) {
			DEB("can not open %s", files[i].c_str());
			return;
		}
		//FILE* outfile = fopen("out.out", "w");
		FILE* outfile = stdout;

		TestData t;
		io_solve(t, file, outfile);
		fclose(file);
		if (outfile != stdout) fclose(outfile);

		std::string check_out = files[i];
		check_out[check_out.size()-2] = 'o';
		check_out[check_out.size()-1] = 'u';
		check_out += 't';

		FILE* expect_file = fopen(check_out.c_str(), "r");
		if (expect_file == nullptr) {
			DEB("test %d. can not open %s\n", i, check_out.c_str());
		} else {
			DEB("test %d. Expects", i);
			char buf[8*1024];
			for (int lines = 0; lines < 3; ++lines) {
				fgets(buf, sizeof(buf) -1, expect_file);
				buf[sizeof(buf) -1] = 0;
				char* end = strchr(buf, '\n');
				if (end != nullptr) *end = '\0';
				DEB("%s", buf);
			}
			fclose(expect_file);
		}
	}
	DEB("test_files done %d", (int) files.size());
}

void test() {
	test_files();

	/*
	std::vector<TestData> tests;
	for(int i = 0; i < tests.size(); ++i)
	{
		auto& t = tests[i];
		DEB("test %d %d", i, t.m);

		solve(t);

		if (t.expected != t.result) {
			DEB("test %d: t.expected %d != %d t.result", i, t.expected, t.result);
			continue;
		}

		DEB("test %d done %d", i, t.result);
	}*/
}
#endif

void io_solve(TestData& t, FILE *input, FILE *output) {
	//DEB("io_solve");

	fscanf(input, "%d %d %d %d\n", &t.x, &t.d, &t.h, &t.m);

	solve(t);

	fprintf(output, "%lld\n", t.result);
}

void solve(TestData& t) {
	//day 1 23
	//double day round

	DEB("%d %d %d", t.d, t.h, t.m);

	//time shit is at        d 29           h 2
	int64_t minute_break =   ((29)*24 + 2)*60;
	int64_t minute_start =  ((t.d)*24 + t.h)*60 + t.m;
	//day end for x1 is    24          hour 23 minute 59
	int64_t day_end = t.x + 23;
	//on round 5 wwe have one more day
	if (t.x >= 5) day_end += 1;
	int64_t minute_end = ((day_end)*24 + 23)*60 + 59;
	DEB("%lld %d %d", day_end, 23, 59);

	//shift one hour 
	if (minute_start >= minute_break) minute_start -= 60;
    if (minute_end >= minute_break) minute_end -= 60;

	t.result = minute_end - minute_start + 1;
}