Problem:
Score : 200 points

Problem Statement

Find the largest square number not exceeding N. Here, a square number is an integer that can be represented as the square of an integer.

Constraints

1 \leq N \leq 10^9

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

Print the largest square number not exceeding N.

Sample Input 1

10

Sample Output 1

9

10 is not square, but 9 = 3 × 3 is. Thus, we print 9.

Sample Input 2

81

Sample Output 2

81

Sample Input 3

271828182

Sample Output 3

271821169

Solution in Go (1.6) (judge verdict: Accepted)

package main
import(
  "fmt"
)
func main(){
  var n, i, temp int
  fmt.Scan(&n)
  l:
  for i=1;i<=n;i++{
    temp=i*i
    if temp>n{
      fmt.Println((i-1)*(i-1))
      break l
    }else if n==1{
      fmt.Println("1")
      break l
    }
  }
}