#include <stdio.h>
#include <vector>
using namespace std;
vector<unsigned> graf[100001];
unsigned comp[100001];
long n,m,i,x,y,q;

void dfs(unsigned nod,unsigned c)
{
    comp[nod]=c;
    for(int i=0;i<graf[nod].size();i++)
        if(comp[graf[nod][i]]==0)
            dfs(graf[nod][i],c);
}
int main()
{
    FILE *f1,*f2;
    f1=fopen("dfs.in","r");
    f2=fopen("dfs.out","w");
    fscanf(f1,"%ld%ld",&n,&m);
    for(i=0;i<m;i++)
    {
        fscanf(f1,"%ld%ld",&x,&y);
        graf[x].push_back(y);
        graf[y].push_back(x);
    }
    for(i=1;i<=n;i++)
        if(comp[i]==0)
            dfs(i,++q);
    fprintf(f2,"%ld",q);
    return 0;
}