# -*- coding:utf-8 -*-
import math
N = int(input())
a = math.floor(math.sqrt(N))
print(a**2)

6f8d5d5229ff7d6c7da9e968b58ed268dfcdbfaf
<mask token>

<mask token>
print(a ** 2)

<mask token>
N = int(input())
a = math.floor(math.sqrt(N))
print(a ** 2)

import math
N = int(input())
a = math.floor(math.sqrt(N))
print(a ** 2)

# -*- coding:utf-8 -*-
import math
N = int(input())
a = math.floor(math.sqrt(N))
print(a**2)
