using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using static System.Console;
using static System.Math;

//using CS_Contest.Graph;
using CS_Contest.Loop;
using CS_Contest.Utils;
using static Nakov.IO.Cin;
using static CS_Contest.IO.IO;
using static CS_Contest.Utils.MyMath;


namespace CS_Contest {
	using Li = List<int>;
	using LLi = List<List<int>>;
	using Ll = List<long>;
	using ti3 = Tuple<int, int, int>;
	using ti2 = Tuple<int, int>;
	internal class Program {
		private static void Main(string[] args) {
			var sw = new StreamWriter(OpenStandardOutput()) { AutoFlush = false };
			SetOut(sw);
			new Calc().Solve();
			Out.Flush();
		}

	    public class Calc
	    {
	        public void Solve() {
	            // ABC051 D
	            int N = NextInt(), M = NextInt();
	            var list = new List<ti3>();

                var wf=new WarshallFloyd(N);
                M.REP(i =>
                {
                    int ai = NextInt()-1, bi = NextInt()-1, ci = NextInt();
                    wf.Add(ai,bi,ci,false);
                    list.Add(new ti3(ai,bi,ci));
                });

	            var res = wf.Run();
                var ans=0;

	            foreach (var edge in list) {
	                var from = edge.Item1;
	                var to = edge.Item2;
	                var cost = edge.Item3;
	                var f = false;
	                for (int i = 0; i < N; i++) {
	                    f |= (res[i][to] == cost + res[i][from]);
	                }

	                if (!f) ans++;
	            }
                ans.WL();
	            return;
	        }
	        public class CostGraph
	        {
	            public struct Edge
	            {
	                public int To { get; set; }
	                public long Cost { get; set; }


	                public Edge(int to, long cost)
	                {
	                    To = to;
	                    Cost = cost;
	                }

	            }

	            public int Size { get; set; }
	            public List<List<Edge>> Adjacency { get; set; }
	            public const long Inf = (long)1e15;

	            public CostGraph(int size)
	            {
	                Size = size;
	                Adjacency = new List<List<Edge>>();
	                Size.REP(_ => Adjacency.Add(new List<Edge>()));
	            }

	            public void Add(int s, int t, long c, bool dir = true)
	            {
	                Adjacency[s].Add(new Edge(t, c));
	                if (!dir) Adjacency[t].Add(new Edge(s, c));
	            }

	        }
	        public class WarshallFloyd : CostGraph
	        {
	            public WarshallFloyd(int size) : base(size)
	            {
	            }

	            public List<Ll> Run()
	            {
	                var rt = new List<Ll>();
	                Size.REP(_ => rt.Add(new Ll()));

	                Size.REP(i => Size.REP(k => rt[i].Add(i == k ? 0 : Inf)));

	                Adjacency.ForeachWith((i, item) => {
	                    foreach (var k in item)
	                    {
	                        rt[i][k.To] = k.Cost;
	                    }
	                });

	                Size.REP(i => Size.REP(j => Size.REP(k => {
	                    rt[j][k] = Min(rt[j][k], rt[j][i] + rt[i][k]);
	                })));

	                return rt;
	            }
	        }

        }
    }
}
namespace Nakov.IO {
	using System;
	using System.Text;
	using System.Globalization;

	public static class Cin {
		public static string NextToken() {
			StringBuilder tokenChars = new StringBuilder();
			bool tokenFinished = false;
			bool skipWhiteSpaceMode = true;
			while (!tokenFinished) {
				int nextChar = Console.Read();
				if (nextChar == -1) {
					tokenFinished = true;
				} else {
					char ch = (char)nextChar;
					if (char.IsWhiteSpace(ch)) {
						if (!skipWhiteSpaceMode) {
							tokenFinished = true;
							if (ch == '\r' && (Environment.NewLine == "\r\n")) {
								Console.Read();
							}
						}
					} else {
						skipWhiteSpaceMode = false;
						tokenChars.Append(ch);
					}
				}
			}

			string token = tokenChars.ToString();
			return token;
		}

		public static int NextInt() {
			string token = Cin.NextToken();
			return int.Parse(token);
		}
		public static long NextLong() {
			string token = Cin.NextToken();
			return long.Parse(token);
		}
		public static double NextDouble(bool acceptAnyDecimalSeparator = true) {
			string token = Cin.NextToken();
			if (acceptAnyDecimalSeparator) {
				token = token.Replace(',', '.');
				double result = double.Parse(token, CultureInfo.InvariantCulture);
				return result;
			} else {
				double result = double.Parse(token);
				return result;
			}
		}
		public static decimal NextDecimal(bool acceptAnyDecimalSeparator = true) {
			string token = Cin.NextToken();
			if (acceptAnyDecimalSeparator) {
				token = token.Replace(',', '.');
				decimal result = decimal.Parse(token, CultureInfo.InvariantCulture);
				return result;
			} else {
				decimal result = decimal.Parse(token);
				return result;
			}
		}

	}
}

namespace CS_Contest.Loop {
	[DebuggerStepThrough]
	public static class Loop {
		public static void REP(this int n, Action<int> act) {
			for (var i = 0; i < n; i++) {
				act(i);
			}
		}

		public static void ForeachWith<T>(this IEnumerable<T> ie, Action<int, T> act) {
			var i = 0;
			foreach (var item in ie) {
				act(i, item);
				i++;
			}
		}

		public static void Foreach<T>(this IEnumerable<T> ie, Action<T> act) {
			foreach (var item in ie) {
				act(item);
			}
		}

	}

	public class Generate
	{
	    public static IEnumerable<int> Seq(int e) => Seq(0, e, 1);
		public static IEnumerable<int> Seq(int s, int e) => Seq(s, e, 1);
		public static IEnumerable<int> Seq(int s, int e, int a) {
			while (s != e) {
				yield return s;
				s += a;
			}
		}
		public static List<T> Repeat<T>(Func<int, T> result, int range) =>
			Enumerable.Range(0, range).Select(result).ToList();
	}
}

namespace CS_Contest.IO {
	using Li = List<int>;
	using Ll = List<long>;

	public static class IO {
		public static void WL(this object obj) => WriteLine(obj);
		public static void WL(this string obj) => WriteLine(obj);
		public static void WL<T>(this IEnumerable<T> list) => list.ToList().ForEach(x => x.WL());

		public static Li NextIntList() => ReadLine().Split().Select(int.Parse).ToList();
		public static Li NextIntList(int n) => Enumerable.Repeat(0, n).Select(x => ReadLine()).Select(int.Parse).ToList();
		public static Ll NextLongList() => ReadLine().Split().Select(long.Parse).ToList();

		public static T Tee<T>(this T t, Func<T, string> formatter = null) {
			if (formatter == null) formatter = arg => arg.ToString();
			formatter(t).WL();
			return t;
		}
		public static void JoinWL<T>(this IEnumerable<T> @this, string sp = " ") => @this.StringJoin(sp).WL();
		public static void W(this object @this) => Write(@this);

	    public static T[,] GetBox<T>(int h, int w, Func<int, int, T> getFunc) {
	        var rt = new T[h, w];
	        for (int i = 0; i < h; i++) {
	            for (int j = 0; j < w; j++) {
	                rt[i, j] = getFunc(i, j);
	            }
	        }

	        return rt;
	    }

	}


}

namespace CS_Contest.Utils {
	using Li = List<int>;
	using Ll = List<long>;
	[DebuggerStepThrough]
	public static class Utils {
	    public static bool AnyOf<T>(this T @this, params T[] these) where T:IComparable {
	        return these.Contains(@this);
	    }

		public static bool Within(int x, int y, int lx, int ly) => !(x < 0 || x >= lx || y < 0 || y >= ly);

		public static void Add<T1, T2>(this List<Tuple<T1, T2>> list, T1 t1, T2 t2) => list.Add(new Tuple<T1, T2>(t1, t2));

		public static string StringJoin<T>(this IEnumerable<T> l, string separator = "") => string.Join(separator, l);

		public static Queue<T> ToQueue<T>(this IEnumerable<T> iEnumerable) {
			var rt = new Queue<T>();
			foreach (var item in iEnumerable) {
				rt.Enqueue(item);
			}
			return rt;
		}
		public static void Swap<T>(ref T x, ref T y) {
			var tmp = x;
			x = y;
			y = tmp;
		}

	    public static List<Tuple<TKey, TValue>> ToTupleList<TKey, TValue>(this Map<TKey, TValue> @this) =>
	        @this.Select(x => Tuple.Create(x.Key, x.Value)).ToList();


		public static Map<TKey, int> CountUp<TKey>(this IEnumerable<TKey> l) {
			var dic = new Map<TKey, int>();
			foreach (var item in l) {
			    dic[item]++;
			}
			return dic;
		}
		public static int Count<T>(this IEnumerable<T> l, T target) => l.Count(x => x.Equals(target));

		public static IEnumerable<T> SkipAt<T>(this IEnumerable<T> @this, int at) {
			var enumerable = @this as T[] ?? @this.ToArray();
			for (var i = 0; i < enumerable.Count(); i++) {
				if (i == at) continue;
				yield return enumerable.ElementAt(i);
			}
		}
	    public static int LowerBound<T>(this List<T> @this, T x) where T : IComparable
	    {
            int lb = -1, ub = @this.Count;
	        while (ub - lb > 1)
	        {
	            int mid = (ub + lb) >> 1;
	            if (@this[mid].CompareTo(x) >= 0) ub = mid;
	            else lb = mid;
	        }
	        return ub;
	    }
	    public static int UpperBound<T>(this List<T> @this, T x) where T : IComparable
	    {
	        int lb = -1, ub = @this.Count;
	        while (ub - lb > 1)
	        {
	            int mid = (ub + lb) >> 1;
	            if (@this[mid].CompareTo(x) > 0) ub = mid;
	            else lb = mid;
	        }
	        return ub;
	    }
    }

	public class Map<TKey, TValue> : Dictionary<TKey, TValue> {
		public Map() : base() { }
		public Map(int capacity) : base(capacity) { }

		public new TValue this[TKey index] {
			get {
				TValue v;
				return this.TryGetValue(index, out v) ? v : base[index] = default(TValue);
			}
			set { base[index] = value; }
		}
	}

	public static class MyMath {
		
		public static T EMin<T>(params T[] a) where T : IComparable<T> => a.Min();
		public static T EMax<T>(params T[] a) where T : IComparable<T> => a.Max();

	}


}



Measured memory_bytes: 15424