def getNumberOfCoefs (n)
    count = 0;
    for i in 1..n/2
        count = count + 1 if n % i == 0            
    end
    return count + 1
end
k = Integer(gets.chomp())
res = 1
index = 1
while (getNumberOfCoefs(res) < k) 
    index = index + 1
    res = res + index;
end
puts res