fn main() {
    let mut nk = String::new();
    std::io::stdin().read_line(&mut nk).ok();
    let nk: Vec<usize> = nk.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nk[0];
    let k = nk[1];
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: Vec<usize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let mut a = a.into_iter().filter(|&v| v > 0).collect::<Vec<usize>>();
    let n = a.len();
    let mut dp = vec![vec![vec![false; k+1]; n+2]; 2];
    dp[0][0][0] = true;
    dp[1][0][0] = true;
    for pat in 0..2 {
        for i in 0..n {
            for j in 0..=k {
                if !dp[pat][i][j] { continue; }
                dp[pat][i+1][j] = true;
                if j + a[i] <= k {
                    dp[pat][i+1][j+a[i]] = true;
                }
            }
        }
        a.reverse();
    }
    if !dp[0][n][k] {
        println!("-1");
        return;
    }
    dp[1].reverse();
    let mut result = 0usize;
// for i in 0..2 { for j in 0..=n+1 { eprintln!("{}: {:?}", i, dp[i][j]); } }
    for i in 0..n {
        if a[i] > k { continue; }
        let mut flg = false;
        for j in 0..=k {
            flg |= dp[0][i][j] && dp[1][i+2][k-j];
        }
        if !flg {
            result += 1;
        }
    }
    println!("{}", result);
}