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.
n=int(raw_input())
i=2
while i:
	c=0
	for j in range(2,i+1):
		if i%j==0:
			c=c+1
		if c>=2:
			break
	if c==1:
		t=i
		n=n-1
		if n==0:
			break
	i=i+1
print t