// https://atcoder.jp/contests/hitachi2020/tasks/hitachi2020_d
//
#![allow(unused_imports)]
use std::io::*;
use std::io::Write;
use std::fmt::*;
use std::str::*;
use std::cmp::*;
use std::collections::*;

// Input macros.
// Original by tanakh: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[allow(unused_macros)]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };

    ($iter:expr, mut $var:ident : $t:tt $($r:tt)*) => {
        let mut $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };

    ($iter:expr, [ next / $t:tt ]) => {
        {
            let len = read_value!($iter, usize);
            (0..len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
        }
    };

    ($iter:expr, switch) => {
        {
            let ty = read_value!($iter, i32);
            if ty == 1 {
                vec![ty, read_value!($iter, i32), read_value!($iter, i32)]
            } else if ty == 2 {
                vec![ty, read_value!($iter, i32)]
            } else {
                vec![ty, read_value!($iter, i32)]
            }
        }
    };

    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };

    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };

    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

#[allow(unused_macros)]
macro_rules! read_line {
    ($t:tt) => {
        {
            let mut s = String::new();
            std::io::stdin().read_line(&mut s).unwrap();
            s.trim_right().parse::<$t>().unwrap()
        }
    }
}

#[allow(unused_macros)]
macro_rules! dvec {
    ($t:expr ; $len:expr) => {
        vec![$t; $len]
    };

    ($t:expr ; $len:expr, $($rest:expr),*) => {
        vec![dvec!($t; $($rest),*); $len]
    };
}

#[allow(unused_macros)]
macro_rules! ifv {
    ($t:expr, $a:expr, $b: expr) => {
        if $t { $a } else { $b }
    }
}

#[allow(unused_macros)]
macro_rules! fill {
    ($t:expr, $v:expr) => {
        for i in 0..$t.len() {
            $t[i] = $v;
        }
    };
}

#[allow(unused_macros)]
macro_rules! join {
    ($t:expr, $glue:expr) => {
        $t.into_iter().map(|w| w.to_string()).collect::<Vec<_>>().join($glue)
    };
}

#[allow(unused_macros)]
macro_rules! debug {
    ($($a:expr),*) => {
        println!(concat!($(stringify!($a), " = {:?}, "),*), $($a),*);
    }
}

// ===

const INF: i64 = 1e9 as i64 + 1;
type Shop = (i64, i64);

fn simulate(a: Shop, b: Shop) -> i64 {
    let mut nt = 0;
    nt += a.0*(nt+1)+a.1+1;
    nt += b.0*(nt+1)+b.1+1;
    nt
}

fn solve(mut shops: Vec<Shop>) -> Vec<i64> {
    shops.sort_by(|&s1, &s2| (simulate(s1, s2)).cmp(&simulate(s2, s1)));
    let n = shops.len();

    let mut dp = dvec!(INF; n+1, 32);
    dp[0][0] = 0;
    for i in 0..n {
        let a = shops[i].0;
        let b = shops[i].1;
        for k in 0..32 {
            if dp[i][k] == INF {
                continue;
            }
            let base = dp[i][k];
            dp[i+1][k] = min(dp[i+1][k], base);

            if k+1 < 32 {
                let to = base+1+a*(base+1)+b;
                dp[i+1][k+1] = min(dp[i+1][k+1], to);
            }
        }
    }
    dp[n].clone()
}

fn main() {
    input! {
        n: usize, t: i64,
        mut shops: [(i64, i64); n]
    };
    let mut end_shop = vec![];
    let mut normal_shop = vec![];
    for (a, b) in shops {
        if a == 0 {
            end_shop.push((a, b));
        } else {
            normal_shop.push((a, b));
        }
    }
    end_shop.sort();

    let result = solve(normal_shop);

    let mut ans = 0;
    for used in 0..32 {
        if result[used] > t {
            continue;
        }
        let mut time = result[used];
        let mut count = used;
        for &(_, b) in &end_shop {
            if time+b+1 <= t {
                time += b+1;
                count += 1;
            }
        }
        ans = max(ans, count);
    }
    println!("{}", ans);
}


Measured memory_bytes: 71924