import math

primeList=[2,3,5,7,11,13,17,19,23]

n=24

while len(primeList)<10001:
    n+=1
    m=math.sqrt(n)
    i=0
    while primeList[i]<=m and n%primeList[i]:
        i+=1
    if primeList[i]>m:
        primeList.append(n)

print n