use std::io::*;
use std::str::FromStr;

const MOD: i32 = 1_000_000_007_i32;

fn main() {
    let mut s = String::new();
    stdin().read_line(&mut s).ok();
    let mut itr = s.split_whitespace().map(|x| i32::from_str(x).unwrap());
    let (n, k) = (itr.next().unwrap(), itr.next().unwrap());

    s.clear();
    stdin().read_line(&mut s).ok();
    let mut itr = s.split_whitespace().map(|x| i32::from_str(x).unwrap());
    let mut v = Vec::new();
    for _i in 0..n {
        v.push(itr.next().unwrap());
    }

    let mut dp = vec![vec![0_i32; 105]; 20005];
    let base = 10002;
    dp[base + 0][0] = 1;

    for j in 0..n {
        let x = v[j as usize] - k;
        for i in 0..20005 {
            if i + x < 0 || i + x >= 20005 {
                continue;
            }
            dp[i as usize][(j + 1) as usize] += dp[i as usize][j as usize];
            dp[i as usize][(j + 1) as usize] %= MOD;
            dp[(i + x) as usize][(j + 1) as usize] += dp[i as usize][j as usize];
            dp[(i + x) as usize][(j + 1) as usize] %= MOD;
        }
    }

    let mut ret = 0;
    for i in base..20005 {
        ret += dp[i as usize][n as usize];
        ret %= MOD;
    }

    println!("{}", (ret + MOD - 1) % MOD);
}