N=int(input())
if N==1:
    print(1)
    exit()
def factorization(n):
    arr = []
    temp = n
    for i in range(2, int(-(-n**0.5//1))+1):
        if temp%i==0:
            cnt=0
            while temp%i==0:
                cnt+=1
                temp //= i
            arr.append([i, cnt])
    if temp!=1:
        arr.append([temp, 1])
    if arr==[]:
        arr.append([n, 1])
    return arr
D=[]
d=10**5-1
for i in range(1,70):
    d+=2
    e=factorization(d)
    if len(e)==1:
        D.append(d)
ans=[]
for i in D:
    for j in D:
        ans.append(i*j)
E=list(set(ans))
E=sorted(E)
print(E[N-2])