C++ :

#include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 5;
int n, m, x, y, cnt[N];


int main() {
    cin >> n >> m;

    while (m--) {
        cin >> x >> y;
        cnt[x]++;
        cnt[y]++;
    }

    long long s = 0;

    for(int i = 1; i <= n; i++){
        s += 1ll * cnt[i] * (cnt[i] - 1) / 2;
    }

    cout << s;

}