import java.util.*;
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		int t = sc.nextInt();
		double a = sc.nextInt();
		double min = 1000000;
		int ans = 0;

		int h[] = new int[n];

		for (int i = 0;i<n ;i++ ) {
			h[i] = sc.nextInt();
		}

		for (int i = 0;i<n ;i++ ) {
			double data = t-h[i]*0.006;
			min = Math.min(min,Math.abs(a-data));
			if (min==Math.abs(a-data)) {
				 ans = i+1;
			}
		}

		System.out.println(ans);
	}
} import java.util.*; util.* java public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		int t = sc.nextInt();
		double a = sc.nextInt();
		double min = 1000000;
		int ans = 0;

		int h[] = new int[n];

		for (int i = 0;i<n ;i++ ) {
			h[i] = sc.nextInt();
		}

		for (int i = 0;i<n ;i++ ) {
			double data = t-h[i]*0.006;
			min = Math.min(min,Math.abs(a-data));
			if (min==Math.abs(a-data)) {
				 ans = i+1;
			}
		}

		System.out.println(ans);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		int t = sc.nextInt();
		double a = sc.nextInt();
		double min = 1000000;
		int ans = 0;

		int h[] = new int[n];

		for (int i = 0;i<n ;i++ ) {
			h[i] = sc.nextInt();
		}

		for (int i = 0;i<n ;i++ ) {
			double data = t-h[i]*0.006;
			min = Math.min(min,Math.abs(a-data));
			if (min==Math.abs(a-data)) {
				 ans = i+1;
			}
		}

		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		int t = sc.nextInt();
		double a = sc.nextInt();
		double min = 1000000;
		int ans = 0;

		int h[] = new int[n];

		for (int i = 0;i<n ;i++ ) {
			h[i] = sc.nextInt();
		}

		for (int i = 0;i<n ;i++ ) {
			double data = t-h[i]*0.006;
			min = Math.min(min,Math.abs(a-data));
			if (min==Math.abs(a-data)) {
				 ans = i+1;
			}
		}

		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int t = sc.nextInt(); t sc.nextInt() sc.nextInt sc double a = sc.nextInt(); a sc.nextInt() sc.nextInt sc double min = 1000000; min 1000000 int ans = 0; ans 0 int h[] = new int[n]; h new int[n] n for (int i = 0;i<n ;i++ ) {
			h[i] = sc.nextInt();
		} int i = 0; int i = 0; i 0 i<n i n i++ i++ i {
			h[i] = sc.nextInt();
		} {
			h[i] = sc.nextInt();
		} h[i] = sc.nextInt() h[i] h i sc.nextInt() sc.nextInt sc for (int i = 0;i<n ;i++ ) {
			double data = t-h[i]*0.006;
			min = Math.min(min,Math.abs(a-data));
			if (min==Math.abs(a-data)) {
				 ans = i+1;
			}
		} int i = 0; int i = 0; i 0 i<n i n i++ i++ i {
			double data = t-h[i]*0.006;
			min = Math.min(min,Math.abs(a-data));
			if (min==Math.abs(a-data)) {
				 ans = i+1;
			}
		} {
			double data = t-h[i]*0.006;
			min = Math.min(min,Math.abs(a-data));
			if (min==Math.abs(a-data)) {
				 ans = i+1;
			}
		} double data = t-h[i]*0.006; data t-h[i]*0.006 t h[i]*0.006 h[i] h i 0.006 min = Math.min(min,Math.abs(a-data)) min Math.min(min,Math.abs(a-data)) Math.min Math min Math.abs(a-data) Math.abs Math a-data a data if (min==Math.abs(a-data)) {
				 ans = i+1;
			} min==Math.abs(a-data) min Math.abs(a-data) Math.abs Math a-data a data {
				 ans = i+1;
			} ans = i+1 ans i+1 i 1 System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		int t = sc.nextInt();
		double a = sc.nextInt();
		double min = 1000000;
		int ans = 0;

		int h[] = new int[n];

		for (int i = 0;i<n ;i++ ) {
			h[i] = sc.nextInt();
		}

		for (int i = 0;i<n ;i++ ) {
			double data = t-h[i]*0.006;
			min = Math.min(min,Math.abs(a-data));
			if (min==Math.abs(a-data)) {
				 ans = i+1;
			}
		}

		System.out.println(ans);
	}
} public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		int t = sc.nextInt();
		double a = sc.nextInt();
		double min = 1000000;
		int ans = 0;

		int h[] = new int[n];

		for (int i = 0;i<n ;i++ ) {
			h[i] = sc.nextInt();
		}

		for (int i = 0;i<n ;i++ ) {
			double data = t-h[i]*0.006;
			min = Math.min(min,Math.abs(a-data));
			if (min==Math.abs(a-data)) {
				 ans = i+1;
			}
		}

		System.out.println(ans);
	}
} Main
import java.util.*;
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		int t = sc.nextInt();
		double a = sc.nextInt();
		double min = 1000000;
		int ans = 0;

		int h[] = new int[n];

		for (int i = 0;i<n ;i++ ) {
			h[i] = sc.nextInt();
		}

		for (int i = 0;i<n ;i++ ) {
			double data = t-h[i]*0.006;
			min = Math.min(min,Math.abs(a-data));
			if (min==Math.abs(a-data)) {
				 ans = i+1;
			}
		}

		System.out.println(ans);
	}
}
