#include <iostream>

using namespace std;

int boldog(int a[200000], int n, int k){
    for(int i = k; i < n-k; i++){
            bool b = true;
            for(int j = 0; j < k; j++){
                if(a[i] < a[i-j-1] || a[i] < a[i+j+1]){
                    b = false;
                }
            }
            if(b){
                return i+1;
            }
        }

    return -1;
}

int main()
{
    int a[200000], n, k;
    cin >> n >> k;

    for(int i = 0; i < n; i++){
        cin >> a[i];
    }

    cout << boldog(a, n, k);


    return 0;
}