#[macro_use]
extern crate serde_derive;
extern crate serde;
extern crate serde_json;
extern crate bincode;

#[derive(Serialize, Deserialize)]
struct City {
    name: String,
    population: usize,
    latitude: f64,
    longitude: f64,
}

fn main() {
    println!("Hi, world!");
}