def isprime(n):
        if n == 1:
                return False
        elif n == 2:
                return True
        elif n == 3:
                return True
        elif n == 5:
                return True
        elif n == 7:
                return True
        elif (n/2)*2 != n:
                return True
        elif (n/3)*3 != n:
                return True
        elif (n/5)*5 != n:
                return True
        elif (n/7)*7 != n:
                return True
        else:
                return False

numprimes = 0
number = 1
while numprimes < 1000:
	if isprime(number):
		numprimes += 1
	number +=1
print number