from collections import defaultdict
from itertools import permutations

N = int(input())
S = input()

if N == 1:
    print(1)
    exit()
if N == 2:
    if S[0] == S[1]:
        print(1)
    else:
        print(2)
    exit()

sum0 = 0
dic = defaultdict(int)
for s in S:
    s = int(s)
    dic[s] += 1
    sum0 += s
X = []
for k, v in dic.items():
    X += [k] * (min(3, v))

Y = set()
for a, b, c in set(permutations(X, 3)):
    y = a * 100 + b * 10 + c + 40 * ((sum0 - a - b - c) % 3)
    y %= 120
    Y.add(y)

print(len(Y))