x=int(input())
x-=1

if x == 0:
    print(1)
    exit()

def  c(n):
    sosu=[True]*(n+1)
    sosu[0],sosu[1] = False,False
    cnt=0
    for i in range(4,n+1,2):
        sosu[i] = False
    
    for i in range(3,int(n**0.5)+1,2):
        if sosu[i] == False:
            continue
        for j in range(i,n//i+1,2):
            sosu[j*i]=False
    return [p for p in range(n + 1) if sosu[p]==True]

n=10**6
t=c(n)

p=[]
cnt=0
for i in range(len(t)):
    if t[i] > 10**5:
        p.append(t[i])
        cnt+=1
    if cnt == 10:
        break
        
ans=[]
for i in range(len(p)-1):
    for j in range(i,len(p)):
        ans.append(p[i]*p[j])
        
ans.sort()
print(ans[x-1])