import sys
input = sys.stdin.readline

x=10**5
import math 
L=math.floor(math.sqrt(x)) # 平方根を求める

Primelist=[i for i in range(x+1)]
Primelist[1]=0 # 1は素数でないので0にする.
 
for i in Primelist:
    if i>L:
        break
    if i==0:
        continue
    for j in range(2*i,x+1,i):
        Primelist[j]=0

Primes=[Primelist[j] for j in range(x+1) if Primelist[j]!=0]
SET_Primes=set(Primes)

ANS=[1]
for i in range(10**10+1,2*10**10):
    for j in SET_Primes:
        if i%j==0:
            break
    else:
        ANS.append(i)

    if len(ANS)==10:
        break
    
print(ANS[int(input())-1])