import std.stdio;
import std.algorithm;
import std.string;
import std.range;
import std.array;
import std.conv;
import std.complex;
import std.math;
import std.ascii;
import std.bigint;
import std.container;
import std.typecons;
import std.functional;

auto readInts() {
        return array(map!(to!int)(readln().strip().split()));
}
auto readInt() {
        return readInts()[0];
}
auto readLongs() {
        return array(map!(to!long)(readln().strip().split()));
}
auto readLong() {
        return readLongs()[0];
}

void readlnTo(T...)(ref T t) {
    auto s = readln().split();
    assert(s.length == t.length);
    foreach(ref ti; t) {
        ti = s[0].to!(typeof(ti));
        s = s[1..$];
    }
}

const real eps = 1e-10;

void main(){
    long n, a;
    readlnTo(n, a);
    auto x = readLongs();
    long calc(long i, long j, long k) {
        if(j == 0 && k == 0) {
            return 1;
        }
        if(i < 0 || j < 0 || k < 0) {
            return 0;
        }
        return memoize!calc(i-1, j, k) + memoize!calc(i-1, j-1, k-x[i]);
    }
    long ans;
    foreach(i; iota(1, n+1)) {
        ans += calc(n-1, i, i*a);
    }
    writeln(ans);
}

