#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::cell::{RefCell, RefMut};
use std::collections::HashMap;
use std::rc::Rc;
fn main() {
    let shared_map: Rc<RefCell<_>> = Rc::new(RefCell::new(HashMap::new()));
    {
        let mut map: RefMut<'_, _> = shared_map.borrow_mut();
        map.insert("africa", 92388);
        map.insert("kyoto", 11837);
        map.insert("piccadilly", 11826);
        map.insert("marbles", 38);
    }
    let total: i32 = shared_map.borrow().values().sum();
    println!("{total}");
}