// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------

use std::io::Write;
use std::collections::*;

type Map<K, V> = BTreeMap<K, V>;
type Set<T> = BTreeSet<T>;
type Deque<T> = VecDeque<T>;

fn run() {
    input! {
        n: usize,
        a: [i32; n],
    }
    let pos = |x: i32| -> usize {
        assert!(x > 0);
        (x as u32).next_power_of_two().trailing_zeros() as usize
    };
    let w = 20;
    let mut value_pos = vec![Set::new(); w];
    let mut pos_value = vec![Set::new(); w];
    let mut dp = vec![0; w];
    for (i, &a) in a.iter().enumerate() {
        if a > 0 {
            let p = pos(a);
            value_pos[p].insert((a, i));
            pos_value[p].insert((i, a));
        }
    }
    let mut ans = 0;
    loop {
        let mut index = n;
        let mut v = 0;
        for (i, set) in pos_value.iter().enumerate() {
            if let Some(&(k, a)) = set.iter().next() {
                if k < index {
                    index = k;
                    v = a + dp[i];
                }
            }
        }
        if index == n {
            break;
        }
        ans += 1;
        let sub = v ;
        let x = pos(sub);
        let del = value_pos[x].range((sub - dp[x], 0)..).cloned().collect::<Vec<_>>();
        for (v, p) in del {
            value_pos[x].remove(&(v, p));
            pos_value[x].remove(&(p, v));
            let v = v + dp[x] - sub;
            if v > 0 {
                let x = pos(v);
                value_pos[x].insert((v - dp[x], p));
                pos_value[x].insert((p, v - dp[x]));
            }
        }
        for i in (x + 1)..w {
            while let Some(&(v, p)) = value_pos[i].iter().next() {
                if pos(v + dp[i]) == i {
                    break;
                }
                value_pos[i].remove(&(v, p));
                pos_value[i].remove(&(p, v));
                let v = v + dp[i] - sub;
                if v > 0 {
                    let x = pos(v);
                    value_pos[x].insert((v - dp[x], p));
                    pos_value[x].insert((p, v - dp[x]));
                }
            }
            dp[i] -= sub;
        }
    }
    println!("{}", ans);
}

fn main() {
    run();
}