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

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

void main()
{
  int n, m, x; readV(n, m, x);
  int[] a; readA(m, a);

  auto as = a.assumeSorted;
  writeln(min(as.lowerBound(x).length, as.upperBound(x).length));
}
