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#include <algorithm>
#include <bitset>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <vector>

using namespace std;

#define PB push_back
#define MP make_pair
#define F first
#define S second
#define ALL(x) (x).begin(),(x).end()
#define SIZE(x) (int)(x).size()
#define CLEAR(tab) memset(tab, 0, sizeof(tab))
#define REP(x, n) for(int x = 0; x < (n); x++)
#define FOR(x, b, e) for(int x = (b); x <= (e); x++)
#define FORD(x, b, e) for(int x = (b); x >= (e); x--)
#define VAR(v, n) __typeof(n) v = (n)
#define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define DEBUG(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__)

typedef long long int LL;
typedef pair<int,int> PII;
typedef vector<int> VI;

const int MXN = 410;
const int C = 262144;
const int INF = 1000000001;
const int MOD = 1000000007;

int n;
vector<int> q = {0, 24, 25, 26, 27, 29};

int calc(int d, int h, int m) {
	int x = (d - 23)* 24 * 60 + h * 60 + m;
	if(x >= 8820)
		return x - 60;
	return x;
}

int main() {
	int x, d, h, m;
	scanf("%d %d %d %d", &x, &d, &h, &m);
	printf("%d\n", calc(q[x] + 1, 0, 0) - calc(d, h, m));
}