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#include<bits/stdc++.h>
using namespace std;

#define int int64_t

const int64_t mod = 1e9+7;
const int maxn = 1e6+10;
int inf;


/*
*/

int x, d, h, m;

void tc()
{
    cin >> x >> d >> h >> m;
    //cout << "x=" << x << " d=" << d << " h=" << h << " m=" << m << endl;
    int ct = (d-23) * 24 * 60 + h * 60 + m;
    int et = 0;
    if (x <= 4)
    {
        //cout << "case x<=4" << endl;
        et = x * 24 * 60 + 23 * 60 + 59;
    }
    else if (x == 5)
    {
        //cout << "case x==5" << endl;
        et = (29-23) * 24 * 60 + 23 * 60 + 59;
        if (d <= 28 || (d == 29 && h <= 2))
        {
            //cout << "case before change of time" << endl;
            et -= 60;
        }
    }
    //cout << "ct=" << ct << endl;
    //cout << "et=" << et << endl;
    int ans = et - ct + 1;
    cout << ans << endl;
}

int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
	inf = numeric_limits<int>::max()/2;

    int T = 1;
    //cin >> T;
    while (T--) tc();

    return 0;
}