Problem:
Power

For given integers m and n, compute mn (mod 1,000,000,007). Here, A (mod M) is the remainder when A is divided by M.

Input

m n

Two integers m and n are given in a line.

Output

Print mn (mod 1,000,000,007) in a line.

Constraints

1 ≤ m ≤ 100

1 ≤ n ≤ 109

Sample Input 1

2 3

Sample Output 1

8

Sample Input 2

5 8

Sample Output 2

390625

Solution in Ruby (judge verdict: Accepted)

m, n = gets.split.map(&:to_i)
mod = 1_000_000_007
answer = 1

while n > 0
  if (n & 1) == 1
    answer = (answer * m) % mod
  end

  m = (m * m) % mod

  n >>= 1
end
puts answer