#include <iostream>
#include <cmath>
using namespace std;
int main() {
cout << "Square root of 64 is: " << sqrt(64) << "\n";
cout << "Round 2.6 to the nearest integer: " << round(2.6) << "\n";
cout << "The natural logarithm of 2 is: " <<log(2) << "\n";
return 0;
}