import java.util.*;
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[] offset = new double[N];
	double min = Double.MAX_VALUE;
	int minIndex = 0;
	for(int i = 0; i<N; i++) {
	    offset[i] = Math.abs((T - 0.006*sc.nextInt()) - A);
	    if(min> offset[i]) {
		min = offset[i];
		minIndex = i;
	    }
	}
	System.out.println(minIndex+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