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#include <stdio.h>
#include <time.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <map> 
#include <string>
#include <vector>  
#include <iostream> 
#include <sstream> 
#include <queue>
#include <algorithm>
#include <assert.h>
#include <set>


using namespace std;

#define ll long long
#define PB 		push_back
#define FOR(a,start,end) 	for(int a=int(start); a<int(end); a++)
#define INF 		INT_MAX
#define SORT(a) 	sort(a.begin(),a.end()) 
#define CL(a,x) 		memset(a,x,sizeof(a))
#define REP(a,x)	for(int a=0;a<x;a++)
#define REP1(a,x)	for(int a=1;a<=x;a++)
#define MP 		make_pair



typedef vector<ll>     vi;
typedef pair<ll, ll>     pii;
typedef vector<string> vs;
typedef vector<pii> vii;
typedef vector<vector<ll> > vvi;
typedef vector<vector<string> > vvs;
typedef vector<pair<string, string> > vss;
typedef pair<string, string> pss;
typedef pair<ll, pii> ppii;
typedef vector<ppii> vppii;
typedef vector<vector<pii> > vvii;
typedef vector<vvi> vvvi;


ll  n, k, q, d, r, g, b, z, p, a, c, m,x,h;

vi vk, va, vd,vb;
vvi vvd, vva0, vvk;
vii vax, vcx;
vvii vvax, vvbx;
pii p1, p2;
string w;
int ik;

int czmin(int x, int d, int h, int m) {
	int a = 0;
	if (x < 5) {
		if (d == va[x])
			a += 60*(h - 12) + m;
		else
			a += 60*(h + 12) + m;
	}
	else {
		
			if (d == va[x])
				a += 60 * (h - 12) + m;
			else if(d==(va[x]+1))
				a += 60 * (h + 12) + m;
			else
				a += 60*(h + 36) + m;
		
			if ((d == 29) && (h >= 3))
				a -= 60;


		
	}
	return a;

}
int main() {
	//freopen("c:\\wojtek\\uva\\pa\\debug\\t1.in", "rt", stdin);
	//freopen("c:\\cygwin64\\home\\plwokow\\.check_sol\\zb1\\in\\320.in", "rt", stdin);
	//d = 1000000007;
	std::ios_base::sync_with_stdio(false);
	std::cin.tie(NULL);

	va.assign(6, 0);
	vb.assign(6,0);
	for (int i = 1; i < 6; i++) {
		vb[i]=2160;
		va[i] = 23 + i-1;
	}
	vb[5] = 3540;
	va[5] = 27;
	
	cin >> x >>d >> h >> m;
	cout << vb[x] - czmin(x, d, h, m)<<endl;
	return 0;

}