#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    
    vector<int> arr(n);
    
    for(int i=0;i<n;i++)
    cin >> arr[i];
    
    int target;
    cin >> target;
    
    int floor ;
    
    int low = 0;
    int high = n-1;
    
    while(low<=high)
    {
        int mid = (low + high) / 2;
        if(arr[mid]<=target)
        {
            floor = arr[mid];
            low = mid + 1;
        }
    } cout<< floor;
}