题解

/*
数学知识：
对于Sn = 1 + 1/2 + 1/3 +...+1/n

*/
#include<iostream>
using namespace std;
int main(){
int k;
double Sn = 1.0;
cin >> k;
int i = 2;
while(Sn <= k){
Sn += 1.0/i;
i += 1;
}
cout << i - 1;
return 0;
}