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use std::io::{self, Read};

fn main() {
    let mut input = String::new();
    io::stdin()
        .read_to_string(&mut input)
        .expect("Failed to read input");
    let mut scan = input.split_whitespace();
    let mut next_num = || scan.next().unwrap().parse::<usize>().unwrap();

    let x = next_num();
    let d = next_num();
    let h = next_num();
    let m = next_num();

    let remaining_days = if x == 5 { 29 - d } else { 23 + x - d };

    let mut result = minutes_to_day_end(d, h, m);
    for i in 0..remaining_days {
        result += minutes_to_day_end(d + 1 + i, 0, 0);
    }

    println!("{}", result);
}

fn minutes_to_day_end(d: usize, h: usize, m: usize) -> usize {
    let minutes_to_drop = if d == 29 && h < 2 { 60 } else { 0 };

    60 * (23 - h) + (60 - m) - minutes_to_drop
}