using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace Contest
{
    struct S
    {
        public int Y, Z;

        public S(int y, int z)
        {
            Y = y;
            Z = z;
        }
    }

    class UnionFind
    {
        private int[] Par, Rank;
        public UnionFind(int max)
        {
            Par = new int[max];
            Rank = new int[max];
            for (int i = 0; i < max; i++)
            {
                Par[i] = i;
            }
        }

        public int Find(int n)
        {
            if (Par[n] == n)
            {
                return n;
            }
            else
            {
                return Find(Par[n]);
            }
        }

        public bool Same(int a, int b)
        {
            return Find(a) == Find(b);
        }

        public void Union(int a, int b)
        {
            a = Find(a);
            b = Find(b);
            if (a == b) return;
            if (Rank[a] < Rank[b])
            {
                Par[a] = b;
            }
            else
            {
                Par[b] = a;
                if (Rank[a] == Rank[b]) Rank[a]++;
            }
        }
    }

    class Program
    {
        private int N, M;
        private int[] X, Y, Z;
        public void Solve()
        {
            var sc = new Scanner();
            N = sc.NextInt();
            M = sc.NextInt();
            X = new int[M];
            Y = new int[M];
            Z = new int[M];
            for (int i = 0; i < M; i++)
            {
                X[i] = sc.NextInt() - 1;
                Y[i] = sc.NextInt() - 1;
                Z[i] = sc.NextInt();

            }
            var uf = new UnionFind(N);
            for (int i = 0; i < M; i++)
            {
                uf.Union(X[i], Y[i]);

            }
            var hs = new HashSet<int>();
            for (int i = 0; i < N; i++)
            {
                hs.Add(uf.Find(i));
            }
            Console.WriteLine(hs.Count);
        }

        static void Main() => new Program().Solve();
    }
}

class Scanner
{
    public Scanner()
    {
        _stream = new StreamReader(Console.OpenStandardInput());
        _pos = 0;
        _line = new string[0];
        _separator = ' ';
    }
    private char _separator;
    private StreamReader _stream;
    private int _pos;
    private string[] _line;
    #region get a element
    public string Next()
    {
        if (_pos >= _line.Length)
        {
            _line = _stream.ReadLine().Split(_separator);
            _pos = 0;
        }
        return _line[_pos++];
    }
    public int NextInt()
    {
        return int.Parse(Next());
    }
    public long NextLong()
    {
        return long.Parse(Next());
    }
    public double NextDouble()
    {
        return double.Parse(Next());
    }
    #endregion
    #region convert array
    private int[] ToIntArray(string[] array)
    {
        var result = new int[array.Length];
        for (int i = 0; i < array.Length; i++)
        {
            result[i] = int.Parse(array[i]);
        }

        return result;
    }
    private long[] ToLongArray(string[] array)
    {
        var result = new long[array.Length];
        for (int i = 0; i < array.Length; i++)
        {
            result[i] = long.Parse(array[i]);
        }

        return result;
    }
    private double[] ToDoubleArray(string[] array)
    {
        var result = new double[array.Length];
        for (int i = 0; i < array.Length; i++)
        {
            result[i] = double.Parse(array[i]);
        }

        return result;
    }
    #endregion
    #region get array
    public string[] Array()
    {
        if (_pos >= _line.Length)
            _line = _stream.ReadLine().Split(_separator);
        _pos = _line.Length;
        return _line;
    }
    public int[] IntArray()
    {
        return ToIntArray(Array());
    }
    public long[] LongArray()
    {
        return ToLongArray(Array());
    }
    public double[] DoubleArray()
    {
        return ToDoubleArray(Array());
    }
    #endregion
}

Measured memory_bytes: 21312