import std.algorithm, std.container, std.conv, std.math, std.range, std.typecons, std.stdio, std.string;

auto rdsp(){return readln.splitter;}
void pick(R,T)(ref R r,ref T t){t=r.front.to!T;r.popFront;}
void readV(T...)(ref T t){auto r=rdsp;foreach(ref v;t)pick(r,v);}
void readA(T)(size_t n,ref T[]t){t=new T[](n);auto r=rdsp;foreach(ref v;t)pick(r,v);}

void main()
{
  int n; readV(n);
  int t, a; readV(t, a); t *= 1000; a *= 1000;
  int[] h; readA(n, h); h[] *= 1000;

  auto d = 10^^9, p = 0;
  foreach (int i, hi; h) {
    auto e = (t-hi*6-a).abs;
    if (e < d) {
      p = i+1;
      d = e;
    }
  }
  writeln(p);
}

