import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner stdin = new Scanner( System.in);
		int n=0,a=0,T=0,ans=1;
		double XX=Double.MAX_VALUE;
		n=stdin.nextInt();
		T=stdin.nextInt();
		a =stdin.nextInt();
		for(int i=1;i<=n;i++){
			double ave=0;
			int H=stdin.nextInt();
			ave=T-H*0.006;
			double X=ave-a;
			if(XX*XX>X*X){
				XX=X;
				ans=i;
			}
		}
		System.out.print(ans);
	}
}



/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