#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n=2,k; double Sn=1.0; cin>>k; for(;Sn<=k;n++){ Sn+=1.0/n; if(Sn>k) break; } cout<<n; return 0; }