import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
        int N = cin.nextInt();
        int T = cin.nextInt();
        int A = cin.nextInt();
        int[] H = new int[N];

        for (int i = 0; i < N; i++) {
            H[i] = cin.nextInt();
        }

        double min = Math.abs(A - (T - H[0] * 0.006));
        int idx = 0;
        for (int i = 1; i < N; i++) {
            double d = Math.abs(A - (T - H[i] * 0.006));
            if (min > d) {
                min = d;
                idx = i;
            }
        }
        System.out.println(idx + 1);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz