using System;
using System.IO;
using System.Text;
using System.Collections.Generic;
class abc086_e {
    static int __cnt = 0;
    static string __mark = "###";
    static void Main(string[] args) {
#if LOCAL_ENVIRONMENT
        StreamReader __sr = new StreamReader("stdin.txt");
        string __str = __sr.ReadToEnd();
        __sr.Close();
        int __index = __str.IndexOf(__mark, 0);
        while (__index != -1) {
            __index = __str.IndexOf(__mark, __index + __mark.Length);
            __cnt++;
        }
        if (__cnt > 0) {
            Console.Write("Eenter test data no(1-{0})? ", __cnt);
            Console.Out.Flush();
            if (!int.TryParse(Console.ReadLine(), out __cnt)) __cnt = 1;
            Console.WriteLine("Select/Default test data: {0}", __cnt);
        }
        var stdin = new System.IO.StreamReader("stdin.txt");
        Console.SetIn(stdin);
#endif
        SimpleScanner sc = new SimpleScanner(__cnt);
        int N = sc.NextInt(), M = sc.NextInt();
#if LOCAL_ENVIRONMENT
    Console.Error.WriteLine($"N:{N}, M:{M}");
#endif
        var ans = N;
        var U = new UnionFind(N);
        for (var m = 0; m < M; m++) {
            int x = sc.NextInt() - 1, y = sc.NextInt() - 1, z = sc.NextInt() % 2;
#if LOCAL_ENVIRONMENT
    Console.Error.WriteLine($"x:{x}, y:{y}, z:{z}");
#endif
            if (U.unite(x, y)) ans -= 1;
        }
#if LOCAL_ENVIRONMENT
//  Console.Error.WriteLine($"UnionFind: {U.par.ToStringA()}");
#endif
        Console.WriteLine(ans);
    } //Main

    public class UnionFind {
        public int[] rnk, par;
        public UnionFind(int n) {
            this.rnk = new int[n];
            this.par = new int[n];
            for (var i = 0; i < n; i++) this.par[i] = i;
        }
        public int root(int x) {
            if (this.par[x] == x) return x;
            return this.par[x] = this.root(this.par[x]);
        }
        public bool unite(int x, int y) {
            var rx = this.root(x);
            var ry = this.root(y);
            if (rx == ry) return false;

            if (this.rnk[rx] < this.rnk[ry]) {
                this.par[rx] = ry;
            } else {
                this.par[ry] = rx;
                if (this.rnk[rx] == this.rnk[ry]) this.rnk[rx] += 1;
            }
            return true;
        }
        public bool same(int x, int y) {
            var rx = this.root(x);
            var ry = this.root(y);
            return rx == ry;
        }
        public int size(int x) {
            return this.rnk[this.root(x)];
        }
        public int find(int x) { return this.root(x); }
        public void union(int x, int y) { this.unite(x, y); }
    }

    public class SimpleScanner {
        private int cnt;
        private string[] items;
        public SimpleScanner(int cnt = 0) {
            this.cnt = 0;
            var sb = new StringBuilder();
            var s = Console.ReadLine();
            while (s != null) {
                sb.Append(s + " ");
                s = Console.ReadLine();
            }
            this.items = sb.ToString().Split(' ');
#if LOCAL_ENVIRONMENT
            if (cnt > 0) {
                int index = Array.IndexOf(this.items, __mark + cnt.ToString());
                this.cnt = index + 1;
            }
            Console.Error.WriteLine("SimpleScanner.cnt: {0}", this.cnt);
            Console.Error.WriteLine("SimpleScanner.items: {0}", this.items.ToStringA());
#endif
        }
        public void SetCnt(int n) { this.cnt = n; }
        public int NextInt() {
            return int.Parse(this.items[this.cnt++]);
        }
        public long NextLong() {
            return long.Parse(this.items[this.cnt++]);
        }
        public string NextString() {
            return this.items[this.cnt++];
        }
        public int[] NextIntArray(int n) {
            if (n < 1) throw new IndexOutOfRangeException("引数は1以上であること！");
            var result = new int[n];
            for (var i = 0; i < n; i++) result[i] = this.NextInt();
#if LOCAL_ENVIRONMENT
            Console.Error.WriteLine("{0}", result.ToStringA());
#endif
            return result;
        }
        public long[] NextLongArray(int n) {
            if (n < 1) throw new IndexOutOfRangeException("引数は1以上であること！");
            var result = new long[n];
            for (var i = 0; i < n; i++) result[i] = this.NextLong();
#if LOCAL_ENVIRONMENT
            Console.Error.WriteLine("{0}", result.ToStringA());
#endif
            return result;
        }
        public string[] NextStringArray(int n) {
            if (n < 1) throw new IndexOutOfRangeException("引数は1以上であること！");
            var result = new string[n];
            for (var i = 0; i < n; i++) result[i] = this.NextString();
#if LOCAL_ENVIRONMENT
            Console.Error.WriteLine("{0}", result.ToStringA());
#endif
            return result;
        }
        public int[][] NextInt2Col(int n) {
            const int M = 2;
            if (n < 1) throw new IndexOutOfRangeException("引数は1以上であること！");
            int[][] result = new int[M][] {
                new int[n],
                new int[n],
            };
            for (var i = 0; i < n; i++) {
                result[0][i] = this.NextInt();
                result[1][i] = this.NextInt();
            }
#if LOCAL_ENVIRONMENT
            Console.Error.WriteLine("NextInt2Col: [");
            for (var i = 0; i < M; i++)
                Console.Error.WriteLine("  {0},", result[i].ToStringA());
            Console.Error.WriteLine("]");
#endif
            return result;
        }
    }

}
static class Extensions {
    public static string ToStringA<T>(this T[] array, string separator = ", ", string braces = "[]") {
        string bL = braces.Length > 0 ? braces[0].ToString() : "";
        string bR = braces.Length > 1 ? braces[1].ToString() : "";
        return bL + String.Join(separator, array) + bR;
    }
}

Measured memory_bytes: 39752