fn main() {
    input! {
        n: usize,
        cond: [(u32, u32); n],
    }
    let m = cond[n - 1].0;
    let mut hist = vec![0; m as usize + 1];
    let mut cnt = 0;
    for (p, e) in cond {
        hist[p as usize] += e;
        cnt += 1;
    }
    let sieve = Sieve::new(m as usize);
    for i in 1..m {
        for &(n, sign) in [(m + 1 - i, !0), (i, 1)].iter() {
            let mut n = n as u32;
            while let Some(p) = sieve.factor(n as usize) {
                let hist = &mut hist[p];
                cnt -= (*hist != 0) as u32;
                let p = p as u32;
                while n % p == 0 {
                    n /= p;
                    *hist += sign;
                }
                cnt += (*hist != 0) as u32;
            }
        }
        if cnt == 0 {
            println!("{} {}", m, i);
            return;
        }
    }
    println!("-1 -1");
}

// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[macro_export]
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)*}
    };
}

#[macro_export]
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)*}
    };
}

#[macro_export]
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, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------
// --------- end sieve ----------
pub struct Sieve {
    size: usize,
    factor: Vec<usize>,
}

impl Sieve {
    pub fn new(size: usize) -> Sieve {
        let mut factor = (0..(size + 1)).collect::<Vec<_>>();
        for i in (2..).take_while(|p| p * p <= size) {
            if i == factor[i] {
                for j in i..(size / i + 1) {
                    factor[j * i] = i;
                }
            }
        }
        Sieve {
            size: size,
            factor: factor,
        }
    }
    pub fn factor(&self, n: usize) -> Option<usize> {
        assert!(n <= self.size);
        if n == 1 {
            None
        } else {
            Some(self.factor[n])
        }
    }
    pub fn factorize(&self, mut n: usize, res: &mut Vec<usize>) {
        assert!(n <= self.size);
        res.clear();
        res.push(1);
        while let Some(p) = self.factor(n) {
            let len = res.len();
            while n % p == 0 {
                n /= p;
                for _ in 0..len {
                    let v = res[res.len() - len] * p;
                    res.push(v);
                }
            }
        }
    }
}
// --------- end sieve ----------