use std::cmp::max;
use std::collections::HashMap;

fn main() {
    let mut nw = String::new();
    std::io::stdin().read_line(&mut nw).ok();
    let nw: Vec<usize> = nw.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nw[0];
    let w = nw[1];
    let mut a: Vec<usize> = vec![];
    for _ in 0..n {
        let mut tempa = String::new();
        std::io::stdin().read_line(&mut tempa).ok();
        let tempa: usize = tempa.trim().parse().unwrap();
        a.push(tempa);
    }

    let mut result = 0usize;
    let mut val: usize = 0usize;
    let mut used: HashMap<usize, usize> = HashMap::new();
    let mut sidx = 0usize;
    for i in 0..n {
        val += a[i];
        if let Some(x) = used.get_mut(&a[i]) {
            while sidx <= *x {
                val -= a[sidx];
                sidx += 1;
            }
            *x = i;
        } else {
            used.insert(a[i], i);
        }
        while w < val {
            val -= a[sidx];
            sidx += 1;
        }
        result = max(result, i + 1 - sidx);
    }
    println!("{}", result);
}