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;
int N, M;
vector<int> g[1010101];
long long deg[1010101], loop[1010101];
bool vis[1010101];
void DFS(int n) {
  vis[n] = true;
  for (int next : g[n]) {
    if (vis[next]) continue;
    DFS(next);
  }
}
int main() {
  scanf("%d %d", &N, &M);
  for (int i = 1; i <= M; i++) {
    int a, b;
    scanf("%d %d", &a, &b);
    if (a == b) {
      loop[a]++;
      continue;
    }
    g[a].push_back(b);
    g[b].push_back(a);
    deg[a]++;
    deg[b]++;
  }
  int cnt = 0;
  for (int i = 1; i <= N; i++) {
    if (vis[i]) continue;
    DFS(i);
    cnt++;
  }
  if (cnt > 1) return !printf("0");
  long long res = 0;
  for (int i = 1; i <= N; i++) {
    res += loop[i] * (loop[i] - 1) / 2;
    res += loop[i] * (M - 1);
    res += deg[i] * (deg[i] - 1) / 2;
  }
  printf("%lld", res);
  return 0;
}
