#[macro_use]
mod input {

use std;
use std::io;

const SPLIT_DELIMITER: char = ' ';

#[macro_export]
#[allow(unused_macros)]
macro_rules! input {
    ( $($x:expr ),*) => {
        {
            let temp_str = input_line_str();
            let mut split_result_iter = temp_str.split_whitespace();
                $(
                let buf_split_result = split_result_iter.next();
                let buf_split_result = buf_split_result.unwrap();
                    ($x) = buf_split_result.parse().unwrap();
                )*
        }
    };
}

#[allow(dead_code)]
pub fn input_line_str() -> String {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();
    s.trim().to_string()
}

#[allow(dead_code)]
pub fn p<T>(t: T)
where
    T: std::fmt::Display,
{
    println!("{}", t);
}

#[allow(dead_code)]
pub fn input_vector2d<T>(line: usize) -> Vec<Vec<T>>
where
    T: std::str::FromStr,
{
    let mut v: Vec<Vec<T>> = Vec::new();

    for _ in 0..line {
        let vec_line = input_vector();
        v.push(vec_line);
    }
    v
}

#[allow(dead_code)]
pub fn input_vector<T>() -> Vec<T>
where
    T: std::str::FromStr,
{
    let mut v: Vec<T> = Vec::new();

    let s = input_line_str();
    let split_result = s.split(SPLIT_DELIMITER);
    for z in split_result {
        let buf = match z.parse() {
            Ok(r) => r,
            Err(_) => panic!("Parse Error"),
        };
        v.push(buf);
    }
    v
}

#[allow(dead_code)]
pub fn str2vec(s: &str) -> Vec<char> {
    let mut v: Vec<char> = Vec::new();
    for c in s.chars() {
        v.push(c);
    }
    v
}
}

use input::*;

fn main() {
    let (n, m): (usize, usize);
    input!(n, m);
    let mut v = vec![vec![999999999; n]; n];
    let mut input_str = vec![];
    for _ in 0..m {
        let (a, b, c): (usize, usize, isize);
        input!(a, b, c);
        input_str.push((a - 1, b - 1, c));
        v[a - 1][b - 1] = c;
        v[b - 1][a - 1] = c;
        v[a - 1][a - 1] = 0;
        v[b - 1][b - 1] = 0;
    }

    for k in 0..n {
        for i in 0..n {
            for j in 0..n {
                v[i][j] = std::cmp::min(v[i][j], v[i][k] + v[k][j]);
            }
        }
    }

    let mut ans = 0;

    for (a, b, c) in input_str {
        let mut flag = false;
        for i in 0..n {
            for j in i + 1..n {
                if v[i][j] == v[i][a] + c + v[b][j] {
                    flag = true;
                    break;
                }
            }
            if flag {
                break;
            }
        }
        if !flag {
            ans += 1;
        }
    }

    p(ans);
}