use std::env;
use std::fs::File;
use std::io::BufReader;
use std::io::BufRead;

fn main() {
    let args: Vec<String> = env::args().collect();
    let input = &args[1];
    let reader = BufReader::new(File::open(input).expect("where file?"));

    let mut sum: i64 = 0;
    let mut max: i64 = 0;
    for line in reader.lines() {
        if !line.as_ref().unwrap().trim().is_empty() {
            sum += line.unwrap().parse::<i64>().unwrap();
        } else {
            if sum > max {
                max = sum;
            }
            sum = 0;
        }
    }

    println!("Max: {}", max);
}