#include <stdio.h>
int main() {
    int score;
    if (scanf("%d", &score) != 1) {
        return 0;
    } if (score < 0) {
        printf("Invalid input"):
    } else {
        if (score >= 50) {
            printf("PASS");
        } else {
            printf("FAIL");
        }
    } return 0;
}