## Mock CCC '18 Contest 1 J5/S3 - A Simulation Problem

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Points: 7 (partial)
Time limit: 0.16s
Java 0.6s
Python 0.6s
Memory limit: 1G

Problem type
Allowed languages
Ada, Assembly, Awk, Brain****, C, C#, C++, COBOL, CommonLisp, D, Dart, F#, Forth, Fortran, Go, Groovy, Haskell, Intercal, Java, JS, Kotlin, Lisp, Lua, Nim, ObjC, OCaml, Octave, Pascal, Perl, PHP, Pike, Prolog, Python, Racket, Ruby, Rust, Scala, Scheme, Sed, Swift, TCL, Text, Turing, VB, Zig

Consider the following function:

function(N):
# in some programming languages, 64-bit integers will be required to represent "threshold"
threshold = N*(N-1)/2
K = 1
# in some programming languages, 64-bit integers will be required to represent "count"
count = 0
while K < N:
L = K+1
print K
while L <= N:
count += 1
L += 1
if 2 * count >= threshold:
exit function
K += 1

Given , compute the last number this function prints out.

#### Constraints #### Input Specification

The input consists of a single line containing the integer .

#### Output Specification

Print, on a single line, the last number this function will print out.

#### Sample Input

4

#### Sample Output

1

#### Sample Input

7

#### Sample Output

2

#### Sample Input

10

#### Sample Output

3

#### Sample Input

1919

#### Sample Output

562

#### Sample Input

290976843

#### Sample Output

85225144