import java.util.*;
import static java.lang.Math.*;
import java.math.BigInteger;

public class Main {

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		int n = sc.nextInt();
		double t = sc.nextDouble();
		double a = sc.nextDouble();
		int result = 0;
		double min = Double.MAX_VALUE;
		for(int i = 0; i < n; i++){
		    double h = sc.nextDouble();
		    if(abs(a - (t - h * 0.006)) < min){
		        result = i + 1;
		        min = abs(a - (t - h * 0.006));
		    }
		}       
		
		// 計算
		
		
		// 出力
		System.out.println(result);
	}
}


/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