#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <map>
#include <stack>
#include <queue>
#include <cstdlib>
#include <numeric>


/*
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MMMP <!!! dMMMb "?$$P" uMMM>;!!! 4MMMMMMMr`:::::::::.........:::::::::::::
MMP';!!! ;MMMMMMn,.".uMMMMM ;!!! MMMMMMMMM,`::::::::::::::::::::::::::::::
MM ;!!!! MMMMMMMMMMMMMMMMMM !!!! MMMMMMMMMb `:::::::::::::::::::::::::::::
M" !!!! uMMMMMMMMMMMMMMMMMP !!! ;MMMMMMMMMMx :::::::::::::::::::::::::::::
P.!!!! ,MMMMMMMMMMMMMMMMMM ,!!! MMMMMMMMMMMMx`::::::::::::::::::::::::::::
!!!!> MMMMMMMMMMMMMMMMMMP !!!',MMMMMMMMMMMMM `:::::::::::::::::::::::::::
*/


int main()
{
	long long a, b;

	std::cin >> a >> b;

	std::vector<long long> v(a);

	for (long long i = 0; i < v.size(); i++) {
		std::cin >> v[i];
	}


	// もとから入っている
	if (std::find(v.begin(), v.end(), b) != v.end()) {
		std::cout << "POSSIBLE" << std::endl;
		return 0;
	}

	// 絶対に無理
	if (b > *std::max_element(v.begin(), v.end())) {
		std::cout << "IMPOSSIBLE" << std::endl;
		return 0;
	}


	long long min = *std::min_element(v.begin(), v.end());

	std::sort(v.begin(), v.end());
	if (v.size() > 1) {
		for (long long i = 0; i < v.size() - 1; i++) {
			if (v[i + 1] - v[i] != 0) {
				min = std::min(min, v[i + 1] - v[i]);
			}
		}
	}

	bool flag = false;
	for (long long i = 0; i < v.size(); i++) {
		if (v[i] % min != 0) {
			flag = true;
			break;
		}
	}

	if (flag == false) {
		if (b % min == 0) {
			std::cout << "POSSIBLE" << std::endl;
		} else {
			std::cout << "IMPOSSIBLE" << std::endl;
		}
		return 0;
	}

	std::cout << "POSSIBLE" << std::endl;


	return 0;
}

Measured memory_bytes: 1024