const MOD: usize = 1e9 as usize + 7;

fn power(base: usize, times: usize) -> usize {
    if times == 0 { return 1usize; }
    if times == 1 { return base; }
    let temp = power(base, times/2);
    temp * temp % MOD * power(base, times%2) % MOD
}

fn main() {
    let mut l = String::new();
    std::io::stdin().read_line(&mut l).ok();
    let l: usize = l.trim().parse().unwrap();
    let pairs = (0..l).map(|_| {
            let mut temp = String::new();
            std::io::stdin().read_line(&mut temp).ok();
            let temp: Vec<usize> = temp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
            (temp[0], temp[1])
        })
        .collect::<Vec<_>>();

    let mut result = 1usize;
    for &(p, e) in pairs.iter() {
        let modval = power(p-1, MOD-2);
        result *= (MOD - (e + 1) + p * modval % MOD * (power(p, e+1) - 1) % MOD) * modval % MOD;
        result %= MOD;
    }
    println!("{}", result);
}