import java.util.*;
public class Main {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int sum = 1;
int fact = 0;
for(int i=0;i<n;i++)
{
int j = sc.nextInt();
for(int k=1;k<=j;k++)
{
sum = sum * k;
}
fact = fact + sum;
}
int ans = sum % 107;
System.out.println(ans);
}
}
ANS should be 43 but my ans is 53 coming
help ASAP