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#pragma GCC optimize("Ofast")
#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
#define int long long

using namespace std;

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int x,d,h,m;
    cin>>x>>d>>h>>m;
    if(x == 1){
        if(d == 23){
            cout<<24*60-h*60-m+24*60;
        }
        else{
            cout<<24*60-h*60-m;
        }
    }
    else if(x == 2){
        if(d == 24){
            cout<<24*60-h*60-m+24*60;
        }
        else{
            cout<<24*60-h*60-m;
        }
    }
    else if(x == 3){
        if(d == 25){
            cout<<24*60-h*60-m+24*60;
        }
        else{
            cout<<24*60-h*60-m;
        }
    }
    else if(x == 4){
        if(d == 26){
            cout<<24*60-h*60-m+24*60;
        }
        else{
            cout<<24*60-h*60-m;
        }
    }
    else{
        if(d == 27){
            cout<<24*60+23*60+24*60-h*60-m;
        }
        else if(d == 28){
            cout<<47*60-h*60-m;
        }
        else{
            if(h < 2){
                cout<<23*60-h*60-m;
            }
            else{
                cout<<24*60-h*60-m;
            }
        }
    }
}