#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ double Sn=0; int n=0,k; cin>>k; while(Sn<=k){ n++; Sn+=1.0/n; } cout<<n; return 0; }