#include <iostream>
using namespace std;

int main()
{
    int n, k;   // fak szama, latotavolsag
    int h[200000];     // fak (N ≤ 200000)

    cin >> n >> k;
    for (int i = 0; i < n; i++)     // beolvasas
        cin >> h[i];

    int lat = -1;
    bool boldog;
    for (int i = k - 1; i < n - k - 1; i++)
    {
        boldog = true;
        for (int j = i - k; j <= i + k; j++)    // leelenorzi hogy a legmagasabb fa a latotavolsagaban
            if (h[j] > h[i])
            {
                boldog = false;
                break;
            }
        if (boldog)
        {
            lat = i + 1;
            break;
        }
    }
    cout << lat << endl;

    return 0;
}