Given the value of n, print the n'th prime number.

Input : A single integer n. 
Output : A single number which is the n'th prime number.
Constraints : 
1 ≤ n ≤ 1000

SAMPLE INPUT
2

SAMPLE OUTPUT
3

Explanation

The first few prime numbers are:
2,3,5,7. So, the answer is 3.
'''
# Read input from stdin and provide input before running code

name = raw_input('What is your name?\n')
print 'Hi, %s.' % name
'''
#print 'Hello World!'


user_ip = int(raw_input())

list1 = [None]*user_ip
counter = 0
k = 1
newVar = None
a = False
y = 2
while list1[counter] ==None:
    for i in range(y,100*k):
        count = 0
        for j in range(1,i+1):
            if i%j == 0:
                count = count +1
        if count == 2:
            list1[counter] = i
            if not counter+1 >= len(list1) :
                counter = counter +1
        if list1[len(list1)-1]!=None:
            break
        if i == (100*k)-1:
            y = 100*k
            k = k+1
        

print list1[counter]