use std::fs;
use std::fs::File;
use std::io::{self, BufReader, prelude::*};

fn main() -> io::Result<()> {
    let file_path = "adunare.in";

    let file: File = File::open(file_path)?;
    let reader: BufReader<File> = BufReader::new(file);

    let mut sum = 0;

    for line in reader.lines() {
        sum += line?.parse::<i32>().unwrap();
    }

    fs::write("adunare.out", sum.to_string());

    return Ok(());
}