N = int(input())

def prime(x):
    prime = [True if x%2==1 else False for x in range(x+1)]
    prime[1] = False
    prime[2] = True

    for i in range(3, int(x**0.5)+2, 2):
        if prime[i]:
            for j in range(2*i, x+1, i):                
                prime[j] = False

    return prime

P = prime(2*10**5)
a = [1]
i = 10**5+1
while len(a) <= 10:
    if not P[i]:
        a.append(i)
    i += 1

print(a[N-1])