var GET=(function(){function f(s){return new g(s);}function g(s){this._s=s.trim().split("\n");this._y=0;}g.prototype.a=function(f){var s=this._s, y=this._y, r;if(typeof s[y]==="string")s[y]=s[y].split(" ").reverse();r=s[y].pop();if(!s[y].length)this._y++;return f?r:+r;};g.prototype.l=function(f){var s=this._s[this._y++].split(" ");return f?s:s.map(a=>+a);};g.prototype.m=function(n,f){var r=this._s.slice(this._y,this._y+=n).map(a=>a.split(" "));return f?r:r.map(a=>a.map(a=>+a));};g.prototype.r=function(n,f){var r=this._s.slice(this._y,this._y+=n);return f?r:r.map(a=>+a);};return f;})();
var o=GET(require("fs").readFileSync("/dev/stdin","utf8"));
function xArray(v){var a=arguments,l=a.length,r="Array(a["+--l+"]).fill(0).map(x=>{return "+v+";})";while(--l)r="Array(a["+l+"]).fill(0).map(x=>"+r+")";return eval(r);}
function unionFind(n){
  this.a=[];for(var i=0;i<=n;i++)this.a[i]=i;
}
unionFind.prototype={
  root:function(x){var a=this.a;return a[x]===x?x:a[x]=this.root(a[x]);},
  same:function(x,y){return this.root(x)===this.root(y);},
  unite:function(x,y){x=this.root(x);y=this.root(y);if(x!==y)this.a[x]=y;},
}

console.log(main());
function main(){
  var n = o.a();
  var m = o.a();
  var uf = new unionFind(n);
  var ans = n;
  for(var i = 0; i < m; i++){
    var t = o.l();
    var x = t[0], y = t[1], z = t[2];
    if(uf.same(x, y))continue;
    uf.unite(x, y);
    ans--;
  }
  return ans;
}