import java.util.Scanner;
public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();
		int T = sc.nextInt();
		int A = sc.nextInt();
		int[] H = new int[N];

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

		double diff = 100001;
		int index = -1;
		for(int i=0;i<H.length;i++) {
			double d = Math.abs(A- (T - H[i]*0.006));
			if(diff >d) {
				diff = d;
				index = i;
			}
		}
//	    int ans = ;
	    System.out.println(index+1);
	    sc.close();
	}



}

/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