n = int(input())
ans = [1]

li1 = [10**5+1+i for i in range(10)]
li2 = [10**5+1+i for i in range(10)]

for i in range(len(li1)):
    for j in range(len(li2)):
        if i == j:
            continue
        ans.append(li1[i]*li2[j])

ans = set(ans)
ans = list(ans)
ans.sort()
print(ans[n-1])