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

fn main() {
	let mut input = String::new();
    io::stdin().read_to_string(&mut input).unwrap();
    let mut it = input.split_whitespace();
	
	let x: i32 = it.next().unwrap().parse().unwrap();
    let d: i32 = it.next().unwrap().parse().unwrap();
    let h: i32 = it.next().unwrap().parse().unwrap();
    let m: i32 = it.next().unwrap().parse().unwrap();
	
	let ldor;
	if x <= 4 { 
		ldor = 23 + x; 
	} else {
		ldor = 24 + x;
	}
	let mut result = (ldor - d)*24*60 + (23-h) * 60 + (60-m);
	if x == 5 && !(d == 29 && h > 2) {
		result -= 60;
	}
	print!("{}", result);	
}