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#ifdef LOC
#include "debuglib.hpp"
#else
#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define deb(...)
#define DBP(...)
#endif
using namespace std;
using   ll         = long long;
using   vi         = vector<int>;
using   pii        = pair<int, int>;
#define pb           push_back
#define mp           make_pair
#define x            first
#define y            second
#define rep(i, b, e) for (int i = (b); i < (e); i++)
#define each(a, x)   for (auto& a : (x))
#define all(x)       (x).begin(), (x).end()
#define sz(x)        int((x).size())

int get(int d, int h, int m) {
	int ret = d*24*60 + h*60 + m;
	if (make_tuple(d, h, m) > make_tuple(29, 2, 0)) {
		ret -= 60;
	}
	return ret;
}

int main() {
	cin.sync_with_stdio(0); cin.tie(0);
	cout << fixed << setprecision(12);

	int x, d, h, m;
	cin >> x >> d >> h >> m;

	int end;
	if (x == 1) end = get(25, 0, 0);
	else if (x == 2) end = get(26, 0, 0);
	else if (x == 3) end = get(27, 0, 0);
	else if (x == 4) end = get(28, 0, 0);
	else if (x == 5) end = get(30, 0, 0);
	else assert(0);

	int ans = end - get(d, h, m);
	cout << ans << '\n';
}