#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    int a[n + 100] = {}, b[n + 100] = {};
    for(int i = 1;i <= n;i++)
    {
        cin >> a[i];
        b[a[i]]++;
    }
    bool flag = true;
    while(flag)
    {
        bool flag1 = false;
        for(int i = 1;i <= n + 99;i++)
            b[b[i]]++;
        for(int i = 1;i < n + 100;i++)
        {
            if(b[i] > 1)
            {
                flag1 = true;
                b[i + 1] = b[i] / 2;
                b[i] %= 2;
            }
        }
    }
    for(int i = n + 99;i > 0;i--)
    {
        if(b[i])
        {
            cout << i;
            return 0;
        }
    }
}

互关看我主页