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#include<cstdio>
const int N=100001,M=200000;
int n,m,u[N],c,i,x[M],y[M],g[N],*v[N];
void D(int i)
{
int j;
for(u[i]=1,j=0;j<g[i];j++)
if(!u[v[i][j]])
D(v[i][j]);
}
int main()
{
freopen("dfs.in","r",stdin),freopen("dfs.out","w",stdout),scanf("%d%d",&n,&m);
for(i=0;i<m;i++)
scanf("%d%d",&x[i],&y[i]),g[x[i]]++,g[y[i]]++;
for(i=1;i<=n;g[i++]=0)
v[i]=new int[g[i]];
for(i=0;i<m;i++)
v[x[i]][g[x[i]]++]=y[i],v[y[i]][g[y[i]]++]=x[i];
for(i=1;i<=n;i++)
if(!u[i])
c++,D(i);
printf("%d",c);
}