#include<bits/stdc++.h>
using namespace std;

#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

#define mygc(c) (c)=getchar_unlocked()
#define mypc(c) putchar_unlocked(c)
void reader(int *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
template <class T, class S> void reader(T *x, S *y){reader(x);reader(y);}
template <class T, class S, class U> void reader(T *x, S *y, U *z){reader(x);reader(y);reader(z);}
void writer(int x, char c){int s=0,m=0;char f[10];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
template<class T> void writerLn(T x){writer(x,'\n');}

char memarr[17000000]; void *mem = memarr;

struct unionFind{
  int *d, N, M;
  inline void malloc(int n){d=(int*)std::malloc(n*sizeof(int));M=n;}
  inline void *malloc(int n, void *mem){d=(int*)mem;M=n;return d+n;}
  inline void init(int n){int i;N=n;rep(i,n)d[i]=-1;}
  inline void init(void){init(M);}
  inline int get(int a){int t=a,k;while(d[t]>=0)t=d[t];while(d[a]>=0)k=d[a],d[a]=t,a=k;return a;}
  inline int connect(int a, int b){if(d[a]>=0)a=get(a);if(d[b]>=0)b=get(b);if(a==b)return 0;if(d[a]<d[b])d[a]+=d[b],d[b]=a;else d[b]+=d[a],d[a]=b;return 1;}
  inline int operator()(int a){return get(a);}
  inline int operator()(int a, int b){return connect(a,b);}
  inline int& operator[](int a){return d[a];}
  inline int sizeList(int res[]){int i,s=0;rep(i,N)if(d[i]<0)res[s++]=-d[i];return s;}
};


int N, M;
int A[300000], B[300000], C[300000];

int main(){
  int i, j, k;
  int res;
  unionFind uf;

  reader(&N,&M);
  rep(i,M) reader(A+i,B+i,C+i), A[i]--, B[i]--;

  uf.malloc(N, mem);
  uf.init(N);

  res = N;
  rep(i,M) res -= uf(A[i],B[i]);

  writerLn(res);

  return 0;
}