#include <iostream>
using namespace std;
int main() {
int a, b, x;
cin >> a >> b >> x;
if (x % 2 == 0 && x >= a && x <= b) {
cout << "PAR";
} else if (x % 2 != 0 && x > b) {
cout << "IMPAR";
} else {
cout << "GRESEALA";
}
return 0;
}
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