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();
int H[] = new int[N];
for(int i =0;i<N;i++){
H[i] = sc.nextInt();
}

double min  = H[0];
int minidx = 0;
for(int i = 0;i < N;i++){
double tem = Math.abs(A -(T - H[i]*0.006));
if(min>tem){
min = tem;
minidx = i;
}
}
System.out.println(minidx + 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