use input_mcr::*;
use std::cmp::*;

struct SegmentTree {
    n: usize,
    xs: Vec<i64>,
}

impl SegmentTree {
    pub fn new(n: usize) -> SegmentTree {
        let n = n.next_power_of_two();
        let xs = vec![0; 2 * n];
        SegmentTree { n, xs }
    }
    pub fn add(&mut self, l: usize, r: usize, x: i64) {
        let mut l = l + self.n;
        let mut r = r + self.n;
        while l < r {
            if l & 1 != 0 {
                self.xs[l] += x;
                l += 1;
            }
            if r & 1 != 0 {
                r -= 1;
                self.xs[r] += x;
            }
            l >>= 1;
            r >>= 1;
        }
    }
    pub fn get(&self, i: usize) -> i64 {
        let mut i = self.n + i;
        let mut res = 0;
        while i != 0 {
            res += self.xs[i];
            i /= 2;
        }
        res
    }
}

fn main() {
    input! {
        n: usize,
        q: usize,
        qs: [(usize,usize); q],
    }
    let mut x_top = 0;
    let mut y_top = 0;
    let mut seg_x = SegmentTree::new(n + 1);
    let mut seg_y = SegmentTree::new(n + 1);
    let mut res = 0;
    for &(t, c) in &qs {
        let c = n - c;
        // eprintln!("t = {}, c = {}, x_top = {}, y_top = {}", t, c, x_top, y_top);
        // eprint!("seg_x = ");
        for i in 0..=n - 2 {
            //// eprint!("{} ", seg_x.get(i));
        }
        // eprintln!();
        // eprint!("seg_y = ");
        for i in 0..=n - 2 {
            //// eprint!("{} ", seg_y.get(i));
        }
        // eprintln!();
        if t == 1 {
            if c < x_top {
                let u = n - 2 - seg_x.get(c) as usize;
                res += u;
            // eprintln!("u = {}", u);
            } else {
                seg_y.add(y_top + 1, n - 2 + 1, (c - x_top) as i64);
                let u = n - 2 - seg_x.get(c) as usize;
                res += u;
                // eprintln!("u = {}", u);
                x_top = c;
            }
        } else {
            if c < y_top {
                let u = n - 2 - seg_y.get(c) as usize;
                res += u;
            // eprintln!("u = {}", u);
            } else {
                seg_x.add(x_top + 1, n - 2 + 1, (c - y_top) as i64);
                let u = n - 2 - seg_y.get(c) as usize;
                res += u;
                // eprintln!("u = {}", u);
                y_top = c;
            }
        }
    }
    // eprintln!("{}", res);
    let res = (n - 2) * (n - 2) - res;
    println!("{}", res);
}
pub mod input_mcr {
    // ref: tanakh <https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8>
    #[macro_export(local_inner_macros)]
    macro_rules! input {
        (source = $s:expr, $($r:tt)*) => {
            let mut parser = Parser::from_str($s);
            input_inner!{parser, $($r)*}
        };
        (parser = $parser:ident, $($r:tt)*) => {
            input_inner!{$parser, $($r)*}
        };
        (new_stdin_parser = $parser:ident, $($r:tt)*) => {
            let stdin = std::io::stdin();
            let reader = std::io::BufReader::new(stdin.lock());
            let mut $parser = Parser::new(reader);
            input_inner!{$parser, $($r)*}
        };
        ($($r:tt)*) => {
            input!{new_stdin_parser = parser, $($r)*}
        };
    }

    #[macro_export(local_inner_macros)]
    macro_rules! input_inner {
        ($parser:ident) => {};
        ($parser:ident, ) => {};
        ($parser:ident, $var:ident : $t:tt $($r:tt)*) => {
            let $var = read_value!($parser, $t);
            input_inner!{$parser $($r)*}
        };
    }

    #[macro_export(local_inner_macros)]
    macro_rules! read_value {
        ($parser:ident, ( $($t:tt),* )) => {
            ( $(read_value!($parser, $t)),* )
        };
        ($parser:ident, [ $t:tt ; $len:expr ]) => {
            (0..$len).map(|_| read_value!($parser, $t)).collect::<Vec<_>>()
        };
        ($parser:ident, chars) => {
            read_value!($parser, String).chars().collect::<Vec<char>>()
        };
        ($parser:ident, char_) => {
            read_value!($parser, String).chars().collect::<Vec<char>>()[0]
        };
        ($parser:ident, usize1) => {
            read_value!($parser, usize) - 1
        };
        ($parser:ident, line) => {
            $parser.next_line()
        };
        ($parser:ident, line_) => {
            $parser.next_line().chars().collect::<Vec<char>>()
        };
        ($parser:ident, $t:ty) => {
            $parser.next::<$t>().expect("Parse error")
        };
    }

    use std::collections::VecDeque;
    use std::io;
    use std::io::BufRead;
    use std::str;

    pub struct Parser<R> {
        pub reader: R,
        buf: VecDeque<u8>,
        parse_buf: Vec<u8>,
    }

    impl Parser<io::Empty> {
        pub fn from_str(s: &str) -> Parser<io::Empty> {
            Parser {
                reader: io::empty(),
                buf: VecDeque::from(s.as_bytes().to_vec()),
                parse_buf: vec![],
            }
        }
    }

    impl<R: BufRead> Parser<R> {
        pub fn new(reader: R) -> Parser<R> {
            Parser {
                reader: reader,
                buf: VecDeque::new(),
                parse_buf: vec![],
            }
        }
        pub fn update_buf(&mut self) {
            loop {
                let (len, complete) = {
                    let buf2 = self.reader.fill_buf().unwrap();
                    self.buf.extend(buf2.iter());
                    let len = buf2.len();
                    (len, buf2.last() < Some(&0x20))
                };
                self.reader.consume(len);
                if complete {
                    break;
                }
            }
        }
        pub fn next<T: str::FromStr>(&mut self) -> Result<T, T::Err> {
            loop {
                while let Some(c) = self.buf.pop_front() {
                    if c > 0x20 {
                        self.buf.push_front(c);
                        break;
                    }
                }
                self.parse_buf.clear();
                while let Some(c) = self.buf.pop_front() {
                    if c <= 0x20 {
                        self.buf.push_front(c);
                        break;
                    } else {
                        self.parse_buf.push(c);
                    }
                }
                if self.parse_buf.is_empty() {
                    self.update_buf();
                } else {
                    return unsafe { str::from_utf8_unchecked(&self.parse_buf) }.parse::<T>();
                }
            }
        }
        pub fn next_line(&mut self) -> String {
            loop {
                while let Some(c) = self.buf.pop_front() {
                    if c >= 0x20 {
                        self.buf.push_front(c);
                        break;
                    }
                }
                self.parse_buf.clear();
                while let Some(c) = self.buf.pop_front() {
                    if c < 0x20 {
                        self.buf.push_front(c);
                        break;
                    } else {
                        self.parse_buf.push(c);
                    }
                }
                if self.parse_buf.is_empty() {
                    self.update_buf();
                } else {
                    return unsafe { str::from_utf8_unchecked(&self.parse_buf) }.to_string();
                }
            }
        }
    }
}


Measured memory_bytes: 9744