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#include <fstream>
#include <vector>
using namespace std;
ifstream f("a.in");
ofstream g("a.out");
vector <int> G[100001];
int i,j,m,n,viz[100001],nr,x,y;
int main()
{f>>n>>m;
for(i=1;i<=m;i++)
{
f>>x>>y;
G[x].push_back(y);
G[y].push_back(x);
}
for(i=1;i<=n;i++)
if(viz[i]==0){
nr++;
for(j=0;j<G[i].size();j++)
viz[G[i][j]]=1;
}
g<<nr;
return 0;
}