Problems

# Mosaic

# Mosaic

Petya has **n** square cards. He wants to create from them a large square (without holes). How many cards he has left?

#### Input

One integer **n** (**1** ≤ **n** ≤ `10`

).^{9}

#### Output

Print the number of cards left.

Input example #1

1

Output example #1

0

Input example #2

27

Output example #2

2