#include<stdio.h>
#include<stdlib.h>

#define NMAX 100001
int *G[NMAX],n,m,d[NMAX],viz[NMAX],nrcomp;
void DFS(int nod)
{
	viz[nod]=1;
	for(int i=1;i<=G[nod][0];i++)
		if(!viz[G[nod][i]])DFS(G[nod][i]);
}
int main()
{
	int i,x,y;
	freopen("dfs.in","r",stdin);
	freopen("dfs.out","w",stdout);
	scanf("%d%d",&n,&m);
	for(i=1;i<=m;i++)
	{
		scanf("%d%d",&x,&y);
		d[x]++;d[y]++;
	}
	fseek (stdin,0,SEEK_SET);
	for(i=1;i<=n;i++)
	{
		G[i]=(int*)malloc((d[i]+1)*sizeof(int));
		G[i][0]=0;
	}
		scanf("%d%d",&n,&m);
	for(i=1;i<=m;i++)
	{
		scanf("%d%d",&x,&y);
		G[x][++G[x][0]]=y;
		G[y][++G[y][0]]=x;
	}
	for(i=1;i<=n;i++)
		if(!viz[i])
		{
			nrcomp++;
			DFS(i);
		}
		printf("%d",nrcomp);
return 0;
}