#include <iostream>

using namespace std;

int main()
{
    int n, viewdis, i;
    cin >> n >> viewdis;

    int pos = -1, seen = 0, chight = 0, hight;
    for (i = 0; i < n; i++) {
        if (seen == viewdis) {
            cout << pos;
            return 0;
        }
        cin >> hight;
        if (chight < hight) {
            pos = i + 1;
            seen = 0;
            chight = hight;
        }
        else { seen++; }
    }
    cout << pos;
}