#include<stdio.h>
int main() {
    scanf("%d", &score);
    if (score < 0) {
        printf("Invalid input");
    }
    else if (score >= 50 && score <= 100)
    {
        printf("PASS");
    }
    else if (score < 50) {
        printf("FAIL");
    }
    else {
        printf("Invalid input");
    }
    return 0;
}