function main(input){
    input = input.split("\n");
    tmp = input[0].split(" ");
    var N = tmp[0];
    var K = tmp[1];
    var A = input[1].split(" ");
    //var N = 5;
    //var K = 12;

    var flag = 1
    while(flag==1) {
        flag = 0;
        if (A.indexOf(K) >= 0) {
            console.log("POSSIBLE");
            return;
        }

        var len = A.length;
        for (var i = 0; i < len - 1; i++) {
            for (var j = i + 1; j < len; j++) {
                var diff = Math.abs(A[i] - A[j]);
                if (A.indexOf(diff) == -1) {
                    A.push(diff);
                    flag = 1;
                }
            }
        }
    }

    console.log("IMPOSSIBLE");
    return;
}

main(require("fs").readFileSync("/dev/stdin", "utf8"));