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();
		double mindiff = Double.MAX_VALUE;
		
		int check = 0;
		int[] h = new int[n];
		
		for(int i = 0;i<n;i++) {
			h[i] =sc.nextInt();
			double T = t-h[i] * 0.006;
			double diff = Math.abs(a-T);
			if(mindiff > diff) {
				mindiff = diff;
				check = i;
			}
		}
		System.out.println(check+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