n = int(input())
s = list(map(int, list(input())))
from collections import defaultdict as dd
d = dd(int)
for e in s:
	d[e] += 1
sums = sum(s)

exp = [1]
for i in range(n):
	exp.append((exp[-1]*10)%120)

ans = set()
for i in range(1,10):
	for j in range(1,10):
		for k in range(1,10):
			if i == j == k and d[i] >= 3:
				ans.add(111*i + 40*(sums - (i+j+k)))
			elif i==j and d[j] >= 2 and d[k]:
				ans.add(111*i + 40*(sums - (i+j+k)))
			elif i == k and d[i] >= 2 and d[j]:
				ans.add(111*i + 40*(sums - (i+j+k)))
			elif j == k and d[j] >= 2 and d[i]:
				ans.add(111*i + 40*(sums - (i+j+k)))
			elif d[i] and d[j] and d[k]:
				ans.add(111*i + 40*(sums - (i+j+k)))
print(len(ans))