#include <cstdio>
#include <vector>
#define DMAX 100002

using namespace std;
FILE * fin=fopen("dfs.in", "r");
FILE * fout=fopen("dfs.out", "w");

int n, m, nr_cmp;
vector<int>a[DMAX];
bool viz[DMAX];

void citire();
void rez();
void DFS(int vf);

int main()
{
citire();
rez();
fprintf(fout, "%d\n", nr_cmp);
fclose(fout);
return 0;
}

void DFS(int vf)
{
int i;
viz[vf]=1;
for (i=0; i<a[vf].size(); ++i)
    if (!viz[a[vf][i]])
        DFS(a[vf][i]);
}

void rez()
{
int i;
for (i=1; i<=n; ++i)
    if (!viz[i])
        {
            nr_cmp++;
            DFS(i);
        }
}

void citire()
{
int i, x, y;
fscanf(fin, "%d %d", &n, &m);
for (i=1; i<=m; ++i)
    {
        fscanf(fin, "%d, %d", &x, &y);
        a[x].push_back(y);
        a[y].push_back(x);
    }
}