def get_primes(n):
    x = [0,0]+[i for i in range(2,n+1)]
    for i in range(int(n**0.5+1)):
        e = x[]
        if e !=0:
            for j in range(e*2, n+1,e):
                x[j] = 0
    return filter(None, x)

PRIMES = get_primes(10000)
n = int(input())
c = 0
for i in range(n):
    p = int(input())
    f = 1
    for e in PRIMES:
        if e >= p:
            break
        if p % e == 0:
            f = 0
            break
    c += f
print c