Problem:
Score : 300 points

Problem Statement

Takahashi is standing on a multiplication table with infinitely many rows and columns.

The square (i,j) contains the integer i \times j. Initially, Takahashi is standing at (1,1).

In one move, he can move from (i,j) to either (i+1,j) or (i,j+1).

Given an integer N, find the minimum number of moves needed to reach a square that contains N.

Constraints

2 \leq N \leq 10^{12}

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

Print the minimum number of moves needed to reach a square that contains the integer N.

Sample Input 1

10

Sample Output 1

5

(2,5) can be reached in five moves. We cannot reach a square that contains 10 in less than five moves.

Sample Input 2

50

Sample Output 2

13

(5, 10) can be reached in 13 moves.

Sample Input 3

10000000019

Sample Output 3

10000000018

Both input and output may be enormous.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Time Limit Exceeded)

import java.util.Scanner;

// https://atcoder.jp/contests/abc144/tasks/abc144_c
public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		double N = sc.nextDouble();
		sc.close();

		double ans = 1e+12;
		for (int i = 1; i <= N/2+1; i++) {
			if (N % i == 0) {
				double ans1 = i + N/i;
				if(ans1<ans) {
					ans = ans1;
				}
			}
		}
		System.out.println((int)ans-2);

		//		int[] array = new int[N];
		//		for(int i=0;i<N;i++) {
		//			array[i]=sc.nextInt();
		//		}
		//		sc.close();
	}
}