#include <bits/stdc++.h>
using namespace std;
vector<int> v[1000005];
int cool[1000005], sz = 0, vis[1000005];
long long int cc = 0;
void dfs(int at) {
  sz++;
  vis[at] = 1;
  for (__typeof(v[at].begin()) it = v[at].begin(); it != v[at].end(); it++)
    if (vis[*it] == 0) dfs(*it);
}
int main() {
  ios_base::sync_with_stdio(false);
  int n, m;
  cin >> n >> m;
  for (int i = 0; i <= m - 1; i++) {
    int x, y;
    cin >> x >> y;
    if (x == y) {
      cool[x] = 1;
      cc++;
      continue;
    }
    v[x].push_back(y);
    v[y].push_back(x);
  }
  for (int i = 1; i <= n; i++) {
    if (v[i].size()) {
      dfs(i);
      break;
    }
  }
  for (int i = 1; i <= n; i++) {
    if (v[i].size() == 0 && cool[i] == 0) sz++;
  }
  if (sz != n) {
    cout << "0";
    return 0;
  }
  long long int ans = 0;
  for (int i = 1; i <= n; i++) {
    long long int x = v[i].size();
    ans += (x * (x - 1)) / 2;
  }
  cout << ans + (cc * (cc - 1)) / 2 + cc * (m - cc);
  return 0;
}
