#include<stdio.h>
int main()
{   
    int k;
	int n;
	double sum;
	scanf("%d",&k);
     for(n=1;n<=100000;++n)
     {
     	sum+=(double)1/n;
     	if(sum>k)
     	{
     		goto end;
		 }
	 }
	 end:
	printf("%d",n);
	return 0;
}