#include <stdio.h>
int main()
{
	double sn = 0 * 1.0, d;
    int k, i = 1;
	scanf("%d", &k);
	while (sn <= k)
	{
		d = 1.0 / i;
		sn += d;
		i++;
	}
	printf("%d", i - 1);
	return 0;
}
/*各位佬能不能看一下我为什么输出i - 1正确，输出i不正确*/

#include<math.h>
#pragma warning(disable:4996) 
int main()
{
    int k, n = 1;
    double sum = 0;
    scanf("%d", &k);
    do
    {
        sum = sum + 1.0 / n;
        n++;
    } while (!(sum > k));
    printf("%d", n-1);
    return 0;
}