100 10
87 73
15 71
14 33
1 4
20 80
65 67
36 36
25 4
22 21
7 97
 4 2
3 3
3 4
 5 4
3 3
4 4
5 5
1 2
 4 4
1 2
2 3
3 1
4 4
 4 3
1 1
2 3
3 4
 1000000 1
255765 255765
 4 3
1 2
2 3
4 4
 4 2
1 1
1 2
 3 3
1 1
2 2
3 3
 5 4
1 1
2 3
2 4
2 5
 4 5
1 4
3 4
1 2
2 3
2 4
 4 4
2 3
2 4
3 4
4 4
 10 9
8 10
3 10
2 8
9 3
4 8
1 10
7 9
5 4
7 3
 10 10
1 2
2 3
3 4
4 5
5 1
6 6
7 7
8 8
9 9
10 10
 5 5
1 4
3 4
1 2
2 3
2 4
 3 3
1 2
2 2
3 3
 5 3
1 1
2 2
3 3
 6 12
1 2
1 3
2 3
1 1
2 2
3 3
4 5
5 6
4 6
4 4
5 5
6 6
 4 4
1 2
2 3
1 3
4 4
 5 4
1 2
3 3
4 4
5 5
 7 13
6 7
2 7
3 7
4 3
5 2
1 4
7 7
3 1
5 5
3 3
1 5
2 6
6 6
 2 2
1 1
2 2
 5 5
1 1
2 2
3 3
4 4
5 5
 1 1
1 1
 7 3
1 1
3 3
6 6
 3 3
1 1
2 3
3 3

0 1 0 0 0 0 0 1 0 0 8 6 12 0 8 0 0 0 0 0 57 0 0 0 0 0
#include <bits/stdc++.h>
using namespace std;
vector<int> g[1234567];
char used[1000009];
int cnt;
int cnt2;
void dfs(int v) {
  used[v] = 1;
  cnt2 += g[v].size();
  for (int i = 0; i < g[v].size(); ++i) {
    int to = g[v][i];
    if (!used[to]) dfs(to);
  }
}
int main() {
  int n, m;
  scanf("%d %d", &n, &m);
  for (int i = 0; i < m; ++i) {
    int u, v;
    scanf("%d %d", &u, &v);
    if (u == v)
      ++cnt;
    else {
      g[u].push_back(v);
      g[v].push_back(u);
    }
  }
  for (int i = 1; i <= n; ++i) {
    if (g[i].size()) {
      dfs(i);
      break;
    }
  }
  if ((m - cnt) * 2 != cnt2)
    return cout << 0, 0;
  else if (cnt == m)
    return cout << 0, 0;
  long long ans = 0;
  for (int i = 1; i <= n; ++i) ans += 1ll * g[i].size() * (g[i].size() - 1) / 2;
  ans += 1ll * cnt * (cnt - 1) / 2;
  ans += 1ll * cnt * (m - cnt);
  cout << ans;
}
