C :

#include<stdio.h>
#include<math.h>
int main()
{
	int n;
	float sum=0;
	scanf("%d",&n);
	int i=1;
	for(i=1;sum<=n;i++)
    {
       sum=sum+1.0/i;
    }
    i--;
    printf("%d",i);
    return 0;
}

C++ :

#include <iostream>  
using namespace std;  
int main(){  
    int i = 1,n,x;
    double s = 0;
    cin>>x;
     while(s <= x){ 
   s = s + 1.0 / i;
   i++;
}
cout<<i - 1<<endl;
    return 0;  
  } 

Pascal :

var x,i:longint; s:real;
begin
  read(x);
  s:=0;
  i:=1;
  while s<=x do
   begin
    s:=s+1/i;
    i:=i+1;
   end;
  writeln(i-1);
end.

Java :

import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
			Scanner scanner=new Scanner(System.in);
			int x=scanner.nextInt();
			float s=0;
			for(int n=1;;n++){
			s=s+(float)1/n;
			if(s>=x){
				System.out.println(n);
				break;
			}
		}
	}
}

Python :

x = int(input())
s = 0
i = 1
while True:
    s += 1 / i
    if s > x:
        print(i)
        break
    i += 1