#include <iostream>
using namespace std;
int main() {
    int x,n=0;
    cin>>x;
    double sn = 0;
    while(1){
    	n+=1;
		sn += 1.0/n; 
		if(sn>x){
    		cout<<n;
    		break;
		}
	}
	return 0;
}