func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, ans, dp[8][8];   int main() {     cin >> n >> m;     for (int i = 1; i <= m; i++) {       int l, r;       cin >> l >> r;       dp[l][r] = dp[r][l] = 1;     }     if (n <= 6)       cout << m;     else {       for (int i = 1; i <= n; i++)         for (int j = i + 1; j <= n; j++) {           int res = 0;           for (int k = 1; k <= n; k++)             if (dp[i][k] && dp[j][k]) res++;           ans = max(ans, m - res);         }       cout << ans;     }   }   