def main():
    n = input()
    a = []
    for i in range(0,n):
        a.append(input())
        a[i] = a[i]%23
    c = 0
    l = []
    for i in range(0,n):
        if a[i] not in l:
            l.append(a[i])
            c+=1
    print c
    return 0
main()