I get timelimit error what should I do ?
any better algo ?!

#include<iostream>
#include<stdio.h>
#include<math.h>
using namespace std;

int main()
{
    int n,k;
    char line[100];
    scanf("%s",line);
    n=atoi(line);
    scanf("%s",line);
    k=atoi(line);
    int power=1;
    int h=1;
    int sum=2;
    if(k>=(n/2))
    {
        while(pow(2,h)<n)
            h++;
    }
    else
    {
        while(sum<=k)
        {
            sum*=2;
            h++;
        }
        while(sum<=n)
        {
            sum+=k;
            h++;
        }

    }
    cout<<h;
    return 0;




}