use std::io::{BufRead, BufReader};
use std::fs::File;

fn main (){
    let filename = "./input_example.txt";
    let file = BufReader::new(File::open(filename).expect("Unable to open file"));
    let mut calories  = 0;

    for line in file.lines() {        
        let snack_calories : i32 = line.trim().parse().unwrap();
        calories += snack_calories;
    }

    println!("Total lines are: {}", calories);
}