macro_rules! read_line_to_tuple {
    ( $( $t:ty ),* ) => {{
        let mut input = String::new();
        std::io::stdin().read_line(&mut input).unwrap();
        let mut iter = input.split_whitespace();
        ( $( iter.next().unwrap().parse::<$t>().unwrap() ),* )
    }};
}

macro_rules! read_line_to_collection {
    ( $t:ty ) => {{
        let mut input = String::new();
        std::io::stdin().read_line(&mut input).unwrap();
        let iter = input.split_whitespace();
        iter.map(|x| x.parse().unwrap()).collect::<$t>()
    }};
}

const MAX: usize = 20_000;
const MOD: i32 = 1_000_000_007;

fn main() {
    let (n, k) = read_line_to_tuple!(usize, usize);
    let a = read_line_to_collection!(Vec<i32>);

    let mut dp = vec![0; MAX as usize + 1];
    dp[MAX / 2] = 1;
    for i in 0..n {
        let x = a[i] - k as i32;
        if x < 0 {
            for j in (-x)..=(MAX as i32) {
                dp[(j + x) as usize] += dp[j as usize];
                dp[(j + x) as usize] %= MOD;
            }
        } else {
            for j in (0..=(MAX as i32 - x)).rev() {
                dp[(j + x) as usize] += dp[j as usize];
                dp[(j + x) as usize] %= MOD;
            }
        }
    }
    
    let mut ans = 0;
    for i in (MAX / 2)..=MAX {
        ans = (ans + dp[i]) % MOD;
    }
    println!("{}", ans - 1);
}