/*
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                 !!!!!!!!!!!!!!!!!!!!!!!                 !         !!!!!!!!!!  
            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!              !!     !!!!!!!!!!!!    
           !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!      !!!!!!!!       
            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!      
             !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!       
              !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  !!!!!!!!!!!!       
       !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!!!!!        
      !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!      !!!!!         
          !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!!          
        !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !          
          !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!                       
           !!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!                         
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                          !!!!!!                                               
                           !!!! 
*/                                               
#include <bits/stdc++.h>
#define MAXN 100005
using namespace std;
/*
 *	author	:  vivekcrux
 */
typedef long long ll;	
typedef pair<ll,ll> pll;


int main()
{
	// freopen("input.txt","r",stdin);

	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

  ll n,t,a,i,j,cl=LONG_MAX,ind=1;
  cin>>n>>t>>a;
  ll h[n+1];
  t *= 1000;
  a *= 1000;
  for(i=1;i<=n;i++)
  {
    cin>>h[i];
    if(abs((t - h[i]*6)-a)<cl)
    {
      cl = abs((t - h[i]*6)-a);
      ind = i;
    }
  } 
  cout<<ind;
    
	return 0;
}

Measured memory_bytes: 256