"use strict";
function I(t,i){this._s=t.split("\n"),this._c=0,this._l=0,this._f=i||Number}I.prototype.a=function(t){var i=this._s[this._l];if(i){var s=i.trim().split(" "),h=s[this._c];return this._c++,s.length===this._c&&(this._c=0,this._l++),t?t(h):this._f(h)}},I.prototype.l=function(t){var i=this._s[this._l];if(i)return this._c=0,this._l++,i.split(" ").map(t||this._f)},module.exports=I;
function Queue(e){this._queue=e?e.slice():[],this._tail=this._queue.length,this._head=0,this._maxLength=100000}Queue.prototype.enqueue=function(e){this._tail+1===this._head||0===this._head&&this._tail===this._maxLength-1?console.error("===queue overflow==="):(this._queue[this._tail]=e,this._tail+=1,this._tail===this._maxLength&&(this._tail=0))},Queue.prototype.dequeue=function(){if(this._tail!==this._head){var e=this._queue[this._head];return this._head+=1,this._head===this._maxLength&&(this._head=0),e}console.error("===queue underflow===")},Queue.prototype.size=function(){var e=this._tail-this._head;return e<0&&(e+=this._maxLength),e};

function main(input) {
  var o = new I(input);

  var n = o.a();
  var m = o.a();

  var x = [], y = [], z = [];
  for (var i = 0; i < m; i++) {
    x.push(o.a());
    y.push(o.a());
    z.push(o.a());
  }

  var adj = [];
  for (var i = 1; i <= n; i++) {
    adj[i] = [];
  }

  for (var i = 0; i < m; i++) {
    adj[x[i]].push(y[i]);
    adj[y[i]].push(x[i]);
  }
  
  var count = 0;
  var color = [];
  for (var i = 1; i <= n; i++) {
    if (color[i] === undefined) {
      color[i] = 1;
      bfs(i, color, adj);
      count += 1;
    }
  }
  console.log(count);
}

function bfs(i, color, adj) {
  var queue = new Queue();
  queue.enqueue(i);
  while (queue.size() > 0) {
    var cur = queue.dequeue();
    adj[cur].forEach(v => {
      if (color[v] === undefined) {
        color[v] = 1;
        queue.enqueue(v);
      }
    })
  }
}


main(require("fs").readFileSync("/dev/stdin", "utf8"));
