#![allow(
    non_snake_case,
    unused_variables,
    unused_assignments,
    unused_mut,
    unused_imports,
    unused_macros,
    dead_code
)]

// use ac_library::*;
use itertools::Itertools;
// use nalgebra::coordinates::X;
use proconio::{input, derive_readable,marker::*};
use std::{cmp::*, collections::*, fmt::*, hash::*, marker::PhantomData, ops::*, println};
// use rustc_hash::*;

fn main() {
    input! {
        n: usize,
        x: isize,
        A: [isize;n],
    }

    println!("{}",max(A.iter().sum::<isize>() - x,0))
}