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#include<stdio.h>
#include<stdlib.h>
#define N 100001
int n,m,u[N],c,i,x[2*N],y[2*N],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]=(int*)malloc(4*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);
return 0;
}