C :

#include<stdio.h>
int main(){
   int N;
   while(scanf("%d",&N)!=EOF){
       int n=1;
       while(n*n<=N){n++;}
        printf("%d\n",n);

   }
    return 0;

   }

C++ :

#include<iostream>
using namespace std;
int main(){
	int a,b=1;
	while(cin>>a){
		for(int i=1; ;i++){
			if(i*i>a)
			{
				cout<<i<<endl;
				break;
			}
		}
	}
	return 0;	
}

Java :

import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner input=new Scanner(System.in);
        while(input.hasNextInt()){
            int N=input.nextInt();
            int n=0;
            while(n*n<=N){
             n++;
        }
            System.out.println(n);
    }
}
}