#include <stdio.h>
d[100010],i;
r(x){
  return d[x]<0?x:(d[x]=r(d[x]));
}
main(n,m,a,b,c){
  scanf("%d%d",&n,&m);
  for(i=n;i--;)d[i]=-1;
  for(;m--;){
    scanf("%d%d%d",&a,&b,&c);
    a=r(a-1);b=r(b-1);
    if(a-b)d[a]+=d[b],d[b]=a,--n;
  }
  i=!printf("%d\n",n);
}