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, a; readV(n, a);
  int[] x; readA(n, x);

  auto s = x.sum, dp = new long[][][](n+1, n+1, s+1);
  dp[0][0][0] = 1;

  foreach (i; 0..n)
    foreach (j; 0..n+1)
      foreach (k; 0..s+1) {
        dp[i+1][j][k] = dp[i][j][k];
        if (j >= 1 && k >= x[i])
          dp[i+1][j][k] += dp[i][j-1][k-x[i]];
      }

  auto r = 0L;
  foreach (j; 1..n+1) {
    if (j*a > s) break;
    r += dp[n][j][j*a];
  }

  writeln(r);
}
