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