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 result = (0..l).map(|i| {
            let (p, e) = pairs[i];
            let modval = power(p-1, MOD-2);
            let pe1 = power(p, e+1);
            let num = MOD + pe1 - 1;
            let num = num % MOD;
            (MOD + pe1 + num * modval % MOD - e - 2) % MOD * modval % MOD
        })
        .fold(1usize, |x, y| x * y % MOD);
    println!("{}", result);
}