import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;


public class Main {

	/**
	 * @param args
	 * @throws IOException 
	 * @throws NumberFormatException 
	 */
	public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO Auto-generated method stub
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		
		String[] tmpArray = br.readLine().split(" ");
		
		int t = Integer.parseInt(tmpArray[0]);
		int a = Integer.parseInt(tmpArray[1]);
		
		double temper[] = new double[n];
		
		tmpArray = br.readLine().split(" ");
		double dt = Double.MAX_VALUE;
		int index = -1;
				
		for(int i = 0; i < n; i++){
			int h = Integer.parseInt(tmpArray[i]);
			
			temper[i] = t - 0.006*h;
			
			if(dt > Math.abs(temper[i] - a)){
				dt = Math.abs(temper[i] - a);
				index = i;
			}
		}
		
		System.out.println(index + 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