#include<bits/stdc++.h>
using namespace std;
//输入保证正确
//输出看仔细
//所有情况都测
//数组定义，保证正确
int n , a[55] , b[55];
bool check(int x)
{
	while( x != 0)
	{
		int t = x%10;
		bool f = 0;
		for(int i = 1;i <= n ; i ++)
		{
			if(t == a[i] )
				f = 1 ;
		}
		if(!f)
			return 0;
		x /= 10;
	}
	return 1;
}
int main()
{
	cin>> n;
	for(int i = 1; i <= n; i ++)
	{
		cin >>a[i];
		b[a[i]] = 1;
	}
	int sum = 0 ;
	for(int i = 100;i < 1000; i ++)
	{
		for(int j = 10;j < 100; j ++)
		{
			if(check(i)==false||check(j)==false)
				continue;
			int t = i * j;
			if(t > 9999) 
				continue;
			if(check(t)==false)
				continue;
			t = (j % 10 ) * i ;
			if( t > 999 )
				continue;
			if(check(t)==false)
				continue;
			t = (j /10 % 10 ) * i ;
			if( t > 999 )
				continue;
			if(check(t)==false)
				continue;
			sum ++ ;
		}
	}
	cout<< sum ;
 	return 0;
}