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
from sys import stdin
from itertools import repeat
def main():
    n, m = map(int, stdin.readline().split())
    dat = map(int, stdin.read().split(), repeat(10, 2 * m))
    if m == 1:
        print 0
        return
    la = [None] * (n + 1)
    xt = [0] * (2 * m)
    lo = 0
    deg = [0] * (n + 1)
    j = 0
    for i in xrange(m):
        x, y = dat[j], dat[j+1]
        xt[j+1] = la[x]
        la[x] = j + 1
        xt[j] = la[y]
        la[y] = j
        j += 2
        if x == y:
            lo += 1
        else:
            deg[x] += 1
            deg[y] += 1
    st = []
    pu = st.append
    po = st.pop
    done = [None] * (n + 1)
    k = 0
    for i in xrange(1, n + 1):
        pu(i)
        done[i] = 1
        while st:
            x = po()
            y = la[x]
            while y is not None:
                z = dat[y]
                if done[z] is None:
                    done[z] = 1
                    pu(z)
                y = xt[y]
        k += 1
    if k != 1:
        print 0
        return
    ans = lo * (lo - 1) / 2 + lo * (m - lo)
    for i in xrange(n + 1):
        ans += deg[i] * (deg[i] - 1) / 2
    print ans
main()
