fn main() {
    let mut io = IO::new();
    input!{ from io,
		n: usize,
		goods: [(i64, i64); n]
    }
	let m = n >> 1;
	let mut fir = Vec::with_capacity(1<<m);
	fir.push(0);
	for &(x, y) in &goods[..m] {
		let nex = fir.iter().map(|&v| v - y).collect::<Vec<i64>>();
		fir.iter_mut().for_each(|v| { *v += x; });
		fir.extend(nex.into_iter());
		fir.sort();
	}
	let mut sec = Vec::with_capacity(1<<(n-m));
	sec.push(0);
	for &(x, y) in &goods[m..] {
		let nex = sec.iter().map(|&v| v - y).collect::<Vec<i64>>();
		sec.iter_mut().for_each(|v| { *v += x; });
		sec.extend(nex.into_iter());
		sec.sort();
	}
	let mut i = 0;
	let mut ans = std::i64::MAX;
	for &x in sec.iter().rev() {
		while i + 1 < fir.len() && (x + fir[i]).abs() > (x + fir[i+1]).abs() {
			i += 1;
		}
		ans = ans.min((x + fir[i]).abs());
	}
	io.println(ans);
}

// ------------ io module start ------------
use std::io::{stdout, BufWriter, Read, StdoutLock, Write};

pub struct IO {
	iter: std::str::SplitAsciiWhitespace<'static>,
	buf: BufWriter<StdoutLock<'static>>,
}

impl IO {
	pub fn new() -> Self {
		let mut input = String::new();
		std::io::stdin().read_to_string(&mut input).unwrap();
		let input = Box::leak(input.into_boxed_str());
		let out = Box::new(stdout());
		IO {
			iter: input.split_ascii_whitespace(),
			buf: BufWriter::new(Box::leak(out).lock()),
		}
	}
	fn scan_str(&mut self) -> &'static str {
		self.iter.next().unwrap()
	}
	pub fn scan<T: Scan>(&mut self) -> <T as Scan>::Output {
		<T as Scan>::scan(self)
	}
	pub fn scan_vec<T: Scan>(&mut self, n: usize) -> Vec<<T as Scan>::Output> {
		(0..n).map(|_| self.scan::<T>()).collect()
	}
	pub fn print<T: Print>(&mut self, x: T) {
		<T as Print>::print(self, x);
	}
	pub fn println<T: Print>(&mut self, x: T) {
		self.print(x);
		self.print("\n");
	}
	pub fn iterln<T: Print, I: Iterator<Item = T>>(&mut self, mut iter: I, delim: &str) {
		if let Some(v) = iter.next() {
			self.print(v);
			for v in iter {
				self.print(delim);
				self.print(v);
			}
		}
		self.print("\n");
	}
	pub fn flush(&mut self) {
		self.buf.flush().unwrap();
	}
}

impl Default for IO {
	fn default() -> Self {
		Self::new()
	}
}

pub trait Scan {
	type Output;
	fn scan(io: &mut IO) -> Self::Output;
}

macro_rules! impl_scan {
	($($t:tt),*) => {
		$(
			impl Scan for $t {
				type Output = Self;
				fn scan(s: &mut IO) -> Self::Output {
					s.scan_str().parse().unwrap()
				}
			}
		)*
	};
}

impl_scan!(i16, i32, i64, isize, u16, u32, u64, usize, String, f32, f64);

impl Scan for char {
	type Output = char;
	fn scan(s: &mut IO) -> Self::Output {
		s.scan_str().chars().next().unwrap()
	}
}

pub enum Bytes {}
impl Scan for Bytes {
	type Output = &'static [u8];
	fn scan(s: &mut IO) -> Self::Output {
		s.scan_str().as_bytes()
	}
}

pub enum Chars {}
impl Scan for Chars {
	type Output = Vec<char>;
	fn scan(s: &mut IO) -> Self::Output {
		s.scan_str().chars().collect()
	}
}

pub enum Usize1 {}
impl Scan for Usize1 {
	type Output = usize;
	fn scan(s: &mut IO) -> Self::Output {
		s.scan::<usize>().wrapping_sub(1)
	}
}

impl<T: Scan, U: Scan> Scan for (T, U) {
	type Output = (T::Output, U::Output);
	fn scan(s: &mut IO) -> Self::Output {
		(T::scan(s), U::scan(s))
	}
}

impl<T: Scan, U: Scan, V: Scan> Scan for (T, U, V) {
	type Output = (T::Output, U::Output, V::Output);
	fn scan(s: &mut IO) -> Self::Output {
		(T::scan(s), U::scan(s), V::scan(s))
	}
}

impl<T: Scan, U: Scan, V: Scan, W: Scan> Scan for (T, U, V, W) {
	type Output = (T::Output, U::Output, V::Output, W::Output);
	fn scan(s: &mut IO) -> Self::Output {
		(T::scan(s), U::scan(s), V::scan(s), W::scan(s))
	}
}

pub trait Print {
	fn print(w: &mut IO, x: Self);
}

macro_rules! impl_print_int {
	($($t:ty),*) => {
		$(
			impl Print for $t {
				fn print(w: &mut IO, x: Self) {
					w.buf.write_all(x.to_string().as_bytes()).unwrap();
				}
			}
		)*
	};
}

impl_print_int!(i16, i32, i64, isize, u16, u32, u64, usize, f32, f64);

impl Print for u8 {
	fn print(w: &mut IO, x: Self) {
		w.buf.write_all(&[x]).unwrap();
	}
}

impl Print for &[u8] {
	fn print(w: &mut IO, x: Self) {
		w.buf.write_all(x).unwrap();
	}
}

impl Print for &str {
	fn print(w: &mut IO, x: Self) {
		w.print(x.as_bytes());
	}
}

impl Print for String {
	fn print(w: &mut IO, x: Self) {
		w.print(x.as_bytes());
	}
}

impl<T: Print, U: Print> Print for (T, U) {
	fn print(w: &mut IO, (x, y): Self) {
		w.print(x);
		w.print(" ");
		w.print(y);
	}
}

impl<T: Print, U: Print, V: Print> Print for (T, U, V) {
	fn print(w: &mut IO, (x, y, z): Self) {
		w.print(x);
		w.print(" ");
		w.print(y);
		w.print(" ");
		w.print(z);
	}
}

mod neboccoio_macro {
	#[macro_export]
	macro_rules! input {
		(@start $io:tt @read @rest) => {};

		(@start $io:tt @read @rest, $($rest: tt)*) => {
			input!(@start $io @read @rest $($rest)*)
		};

		(@start $io:tt @read @rest mut $($rest:tt)*) => {
			input!(@start $io @read @mut [mut] @rest $($rest)*)
		};

		(@start $io:tt @read @rest $($rest:tt)*) => {
			input!(@start $io @read @mut [] @rest $($rest)*)
		};

		(@start $io:tt @read @mut [$($mut:tt)?] @rest $var:tt: [[$kind:tt; $len2: expr]; $len1:expr] $($rest:tt)*) => {
			let $($mut)* $var = (0..$len1).map(|_| $io.scan_vec::<$kind>($len2)).collect::<<$kind as Scan>::Output>();
			input!(@start $io @read @rest $($rest)*)
		};

		(@start $io:tt @read @mut [$($mut:tt)?] @rest $var:tt: [$kind:tt; $len:expr] $($rest:tt)*) => {
			let $($mut)* $var = $io.scan_vec::<$kind>($len);
			input!(@start $io @read @rest $($rest)*)
		};

		(@start $io:tt @read @mut [$($mut:tt)?] @rest $var:tt: $kind:tt $($rest:tt)*) => {
			let $($mut)* $var = $io.scan::<$kind>();
			input!(@start $io @read @rest $($rest)*)
		};

		(from $io:tt $($rest:tt)*) => {
			input!(@start $io @read @rest $($rest)*)
		};
	}
}

// ------------ io module end ------------


#[cfg(test)]
mod tests {
	use super::*;
	use crate::input;

	#[test]
	fn test_input_ignore() {
		let s =
		"5 5
		1 2 3 4 5
		0 0
		1 8 7
		0 4
		0 2
		1 90 178189289
		".to_string();
		let mut io = IO {
			iter: Box::leak(s.into_boxed_str()).split_ascii_whitespace(),
			buf: BufWriter::new(Box::leak(Box::new(stdout())).lock()),
		};
		let (n, q) = io.scan::<(usize, usize)>();
		assert_eq!(n, 5);
		assert_eq!(q, 5);
		let a = io.scan_vec::<Usize1>(n);
		assert_eq!(a, vec![0, 1, 2, 3, 4]);
		let mut buf = Vec::new();
		for _ in 0..q {
			if io.scan::<u32>() == 0 {
				let idx: usize = io.scan::<usize>();
				// io.println(a[idx]);
				buf.push((idx, a[idx]))
			} else {
				let res = (io.scan::<usize>(), io.scan::<usize>());
				// io.println(res);
				buf.push(res);
			}
		}
		assert_eq!(buf, [(0, 0), (8, 7), (4, 4), (2, 2), (90, 178189289)]);
	}

	#[test]
	fn test_input_macro_ignore() {
		let s =
		"5 5
		1 2 3 4 5
		5 apple
		6 banana
		9 chocolate
		8 doughnut
		3 egg
		".to_string();
		let mut io = IO {
			iter: Box::leak(s.into_boxed_str()).split_ascii_whitespace(),
			buf: BufWriter::new(Box::leak(Box::new(stdout())).lock()),
		};
		input! {
			@start io @read @rest
			n: usize, mut q: usize,
			mut a: [Usize1; n],
			query: [(usize, Chars); q]
		}
		assert_eq!(n, 5);
		assert_eq!(q, 5);
		q *= 10;
		assert_eq!(q, 50);
		assert_eq!(a, vec![0, 1, 2, 3, 4]);
		a.push(5);
		assert_eq!(a, vec![0, 1, 2, 3, 4, 5]);
		for (v, c) in &query {
			assert_eq!(*v, c.len());
		}
	}
}