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();
		int A = sc.nextInt();
		int H[] = new int[N];
		for(int i = 0; i < N; i++) {
			H[i] = sc.nextInt();
		}
		int ans = 0;
		double min = Double.MAX_VALUE;
		for(int i = 0; i < N; i++) {
			if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				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();
		int A = sc.nextInt();
		int H[] = new int[N];
		for(int i = 0; i < N; i++) {
			H[i] = sc.nextInt();
		}
		int ans = 0;
		double min = Double.MAX_VALUE;
		for(int i = 0; i < N; i++) {
			if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				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();
		int A = sc.nextInt();
		int H[] = new int[N];
		for(int i = 0; i < N; i++) {
			H[i] = sc.nextInt();
		}
		int ans = 0;
		double min = Double.MAX_VALUE;
		for(int i = 0; i < N; i++) {
			if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				ans = i + 1;
			}
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int T = sc.nextInt();
		int A = sc.nextInt();
		int H[] = new int[N];
		for(int i = 0; i < N; i++) {
			H[i] = sc.nextInt();
		}
		int ans = 0;
		double min = Double.MAX_VALUE;
		for(int i = 0; i < N; i++) {
			if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				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 int A = sc.nextInt(); A sc.nextInt() sc.nextInt sc 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 int ans = 0; ans 0 double min = Double.MAX_VALUE; min Double.MAX_VALUE Double Double.MAX_VALUE for(int i = 0; i < N; i++) {
			if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				ans = i + 1;
			}
		} int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
			if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				ans = i + 1;
			}
		} {
			if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				ans = i + 1;
			}
		} if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				ans = i + 1;
			} Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) Math.abs Math ((double)T - (double)H[i] * 0.006) - (double)A ((double)T - (double)H[i] * 0.006) (double)T (double)H[i] * 0.006 (double)H[i] H i 0.006 (double)A min {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				ans = i + 1;
			} min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) min Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) Math.abs Math ((double)T - (double)H[i] * 0.006) - (double)A ((double)T - (double)H[i] * 0.006) (double)T (double)H[i] * 0.006 (double)H[i] H i 0.006 (double)A 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();
		int A = sc.nextInt();
		int H[] = new int[N];
		for(int i = 0; i < N; i++) {
			H[i] = sc.nextInt();
		}
		int ans = 0;
		double min = Double.MAX_VALUE;
		for(int i = 0; i < N; i++) {
			if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				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();
		int A = sc.nextInt();
		int H[] = new int[N];
		for(int i = 0; i < N; i++) {
			H[i] = sc.nextInt();
		}
		int ans = 0;
		double min = Double.MAX_VALUE;
		for(int i = 0; i < N; i++) {
			if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				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();
		int A = sc.nextInt();
		int H[] = new int[N];
		for(int i = 0; i < N; i++) {
			H[i] = sc.nextInt();
		}
		int ans = 0;
		double min = Double.MAX_VALUE;
		for(int i = 0; i < N; i++) {
			if(Math.abs(((double)T - (double)H[i] * 0.006) - (double)A) < min) {
				min = Math.abs(((double)T - (double)H[i] * 0.006) - (double)A);
				ans = i + 1;
			}
		}
		System.out.println(ans);
	}
}
