Problems

# Two factors

# Two factors

Find the least number $n$ that can we represented as a product $n = a \cdot b$ in $k$ ($1 ≤ k ≤ 50$) ways. Products $a \cdot b$ and $b \cdot a$ are the same, all numbers are positive integers.

#### Input

One number $k$.

#### Output

Print one number $n$.

Input example #1

1

Output example #1

1

Input example #2

2

Output example #2

4