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 JAVA (judge verdict: Wrong Answer)

import java.io.*;
import java.util.*;
import java.lang.ArrayIndexOutOfBoundsException;


class Main {
	static Scanner sc = new Scanner(new InputStreamReader(System.in));
	public static void main(String[] args) throws Exception {
		int m = sc.nextInt();
		int n = sc.nextInt();
		System.out.println(pow(m, n));
	}
	
	static long pow(long m, long n) {
		long mod = 1000000007L;
		if(n == 0) return 1L;
		if(n % 2L == 0) {
			return pow(m*m % mod, n/2L) % mod;
		} else {
			return pow(m+m % mod, n/2L) * m % mod;
		}
	}
}


/**
 * ????´???°
 */
class Complex {
	static Complex I = new Complex(0, 1);
	
	double r = 0.0;
	double i = 0.0;
	Complex(double r, double i) {
		this.r = r;
		this.i = i;
	}
	
	/**
	 * ???
	 */
	public Complex add(Complex a) {
		return new Complex(r * a.r, i + a.i);
	}
	
	/**
	 * ???
	 */
	public Complex mul(Complex a) {
		return new Complex(
				r * a.r - i * a.i,
				r * a.i + i * a.r);
	}
	
	public Complex divide(double a) {
		return new Complex(r/a, i/a);
	}
	
	public Complex inverse() {
		double b = 1 / (r*r + i*i);
		return new Complex(r/b, -i/b);
	}
	    

	@Override
	public String toString(){
		return r + "+" + i + "i";
	}
}




// --- ????????????????????????????????? ----------
/**
 * MyUtil
 * @author yoshikyoto
 */
class MyIO {
	public static int toInt(boolean[] a){
		int pow = 1, ret = 0, l = a.length;
		for(int i = 0; i < l; i++){
			if(a[i]) ret += pow;
			pow *= 2;
		}
		return ret;
	}
	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	public static int ins[];
	public static int[] readIntMap() throws IOException{return parseInt(readLine().split(" "));}
	public static int readIntMap(int i) throws Exception{
		if(i == 0) ins = readIntMap();
		return ins[i];
	}
	public static int[][] readIntMap(int n, int m) throws IOException{
		int[][] ret = new int[n][];
		for(int i = 0; i < n; i++) ret[i] = readIntMap();
		return ret;
	}
	public static int[] readIntToMap(int n) throws IOException{
		int[] ret = new int[n];
		for(int i = 0; i < n; i++) ret[i] = readInt();
		return ret;
	}
	public static int[] readNoDistIntMap() throws IOException{
		String[] strs = readLine().split("");
		int l = strs.length;
		int[] ret = new int[l-1];
		for(int i = 1; i < l; i++)
			ret[i-1] = parseInt(strs[i]);
		return ret;
	}
	public static String readLine() throws IOException{return br.readLine();}
	public static int readInt() throws IOException{return Integer.parseInt(br.readLine());}
	public static int[] parseInt(String[] arr){
		int[] res = new int[arr.length];
		for(int i = 0; i < arr.length; i++)res[i] = Integer.parseInt(arr[i]);
		return res;
	}
	public static double[] parseDouble(String[] arr){
		double[] res = new double[arr.length];
		for(int i = 0; i < arr.length; i++)res[i] = Double.parseDouble(arr[i]);
		return res;
	}
	public static boolean[] parseBool(String[] arr){
		int[] t = parseInt(arr);
		boolean[] res = new boolean[t.length];
		for(int i = 0; i < t.length; i++){
			if(t[i] == 1){res[i] = true;
			}else{res[i] = false;}
		}
		return res;
	}
	public static int parseInt(Object o){
		return Integer.parseInt(o.toString());
	}
}