fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();

    let mut result: Vec<isize> = vec![0; 4 * 1e5 as usize + 2];
    for _ in 0..n {
        let mut xr = String::new();
        std::io::stdin().read_line(&mut xr).ok();
        let xr: Vec<isize> = xr.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        let x = (xr[0] + 2 * 1e5 as isize) as usize;
        let r = xr[1] as usize;
        result[x-r] += 1;
        result[x+r+1] -= 1;
    }

    for i in 0..result.len()-1 {
        result[i+1] += result[i];
    }
    println!("{}", result.iter().max().unwrap());
}