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use std::io;
use std::io::Write;
use std::str;

/// https://github.com/EbTech/rust-algorithms/blob/master/src/scanner.rs
pub struct Scanner<R> {
    reader: R,
    buffer: Vec<String>,
}

impl<R: io::BufRead> Scanner<R> {
    pub fn new(reader: R) -> Self {
        Self {
            reader,
            buffer: vec![],
        }
    }

    pub fn token<T: str::FromStr>(&mut self) -> T {
        loop {
            if let Some(token) = self.buffer.pop() {
                return token.parse().ok().expect("Failed parse");
            }
            let mut input = String::new();
            self.reader.read_line(&mut input).expect("Failed read");
            self.buffer = input.split_whitespace().rev().map(String::from).collect();
        }
    }
}

fn main() {
    let mut scan = Scanner::new(io::stdin().lock());
    let mut out = io::BufWriter::new(io::stdout().lock());

    let x = scan.token::<i32>();
    let d = scan.token::<i32>();
    let h = scan.token::<i32>();
    let m = scan.token::<i32>();

    let till_midnight = (23-h)*60+(60-m);
    let days_after_start = d-22-x;
    let time_shift_penalty = if d == 29 && h >= 2 { 0 } else { 60 };

    if x <= 4 {
        writeln!(out, "{}", (1-days_after_start)*60*24 + till_midnight).unwrap();
    } else {
       writeln!(out, "{}", (2-days_after_start)*60*24 + till_midnight - time_shift_penalty).unwrap();
    }
}