#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<cmath>
#include<set>
#include<vector>
#include<ctime>
#define ll long long
#define pr(x) cerr<<#x<<"="<<x<<endl
using namespace std;
int main()
{
	if (i<=500) printf("POSSIBLE");
	else printf("IMPOSSIBLE");
}