#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(){ int k,n,m=0,s=1,y,a=2,b=1,c=1; cin>>n; s=a/b; for(int k=2;k<=n;k++){ m=a+c; y=b=c; c++; s=a/b; } printf("%.4lf",s); return 0; }