#include <stdio.h>
#include <stdlib.h>
#include "readline.h"
#include "factorial.h"

int main(int argc, char *argv[]) {
	char *str = (char *) malloc(51);
	int t = 0,
	    i = 0;
	scanf("%d\n", &t);
	while (i < t) {
		if (read_line(str)) {
			int a = atoi(str);
			char *str = factorial(a);
			if (t != NULL) {
			    puts(t);
			    free(t);
			} else {
			    printf("Overflow!\n");
			}
		} else {
			printf("%d\n", -1);
		}
		++i;
	}
	free(str);
	return 0;
}