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

int x, d, h, m;
int out=0;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    
    cin >> x >> d >> h >> m;
    
    if (x == 1) {
        
        if (d == 23) {
            out += 1440;
            out += (24-h-1)*60;
            out += 60-m;
        } else {
            out += (24-h-1)*60;
            out += 60-m;
        }
        
    } else if (x == 2) {
        
        if (d == 24) {
            out += 1440;
            out += (24-h-1)*60;
            out += 60-m;
        } else {
            out += (24-h-1)*60;
            out += 60-m;
        }          
        
    } else if (x == 3) {
        
        if (d == 25) {
            out += 1440;
            out += (24-h-1)*60;
            out += 60-m;
        } else {
            out += (24-h-1)*60;
            out += 60-m;
        }
        
        
    } else if (x == 4) {
        
        if (d == 26) {
            out += 1440;
            out += (24-h-1)*60;
            out += 60-m;
        } else {
            out += (24-h-1)*60;
            out += 60-m;
        }
        
        
    } else {
        
        if (d == 27) {
            out += 47*60;
            out += (24-h-1)*60;
            out += 60-m;
        } else if (d == 28) {
            out += 23*60;
            out += (24-h-1)*60;
            out += 60-m;
        } else {
               
            if (h < 2) {
                out += (24-h-2)*60;
                out += 60-m;
            } else {
                out += (24-h-1)*60;
                out += 60-m;
            }
            
        }
    }
    
    cout << out << "\n";
    
    return 0;
}