#include <iostream>
#include <cmath>
using namespace std;

int main() {
    cout<<sqrt(64)<<"\n";
    cout<<log(2)<<"\n";
    cout<<round(2.6)<<"\n";
    cout<<sqrt(81)<<"\n";
    cout<<log(9)<<"\n";
    cout<<round(8.4)<<"\n";
    cout<<sqrt(78)<<"\n";
    cout<<log(98)<<"\n";

    return 0;
    
}