#include <cstdio>
#include <vector>

using namespace std;

int cc;
vector<int> G[100005];
vector<int> viz;

int dfs(int u) {
    viz[u] = cc;
    for(int i = 0; i < G[u].size(); ++ i) {
        int v = G[u][i];
        if(!viz[v]) {
            dfs(v);
        }
    }
}

int main() {
    freopen("dfs.in", "r", stdin);
    freopen("dfs.out", "w", stdout);

    int n, m, u, v;

    scanf("%d%d", &n, &m);

    for(int i = 1; i <= m; ++ i) {
        scanf("%d%d", &u, &v);
        G[u].push_back(v);
        G[v].push_back(u);
    }

    viz.assign(n + 1, 0);

    for(int i = 1; i <= n; ++ i) {
        if(!viz[i]) {
            ++ cc;
            dfs(i);
        }
    }

    printf("%d", cc);

    return 0;
}