#include <stdio.h>
#include <stdlib.h>
int main()
{
int n, k;
double s;
scanf("%d", &k);
s = 0.0;
n = 1;
while (1) //死循环
{
s = s + 1.0/n; //求s=1+1/2+...+1/n
if(s > k)
{
printf("%d\n", n);
break; //跳出死循环
}
n++;
}
return 0;
}