func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 150001;   int a[N], vis[N];   int main() {     int n;     while (cin >> n) {       for (int i = 1; i <= n; i++) cin >> a[i];       sort(a + 1, a + n + 1);       memset(vis, 0, sizeof(vis));       int ans = 0;       for (int i = 1; i <= n; i++) {         if (vis[a[i] - 1] == 0 && a[i] != 1)           vis[a[i] - 1] = 1, ans++;         else if (vis[a[i]] == 0)           vis[a[i]] = 1, ans++;         else if (vis[a[i] + 1] == 0)           vis[a[i] + 1] = 1, ans++;       }       cout << ans << endl;     }     return 0;   }   